configure: do not echo most inherited `LDFLAGS` to config files

`libcurl.pc` `Libs.private` (since 8.11.0, and in `Libs` before 7.20.0)
and `curl-config` `--static-libs` (since 7.17.1, a

configure: do not echo most inherited `LDFLAGS` to config files

`libcurl.pc` `Libs.private` (since 8.11.0, and in `Libs` before 7.20.0)
and `curl-config` `--static-libs` (since 7.17.1, and in `Libs` between
7.7.2-7.25.0). This included all flags inherited from the environment,
in addition to those coming from dependency detections.

To avoid spilling all linker flags inherited from the environment to
the libcurl config files, this patch omits them all, except `-L`, `-F`,
`--library-path=` and `-framework` options, which are still passed.
The rationale for the exceptions is that `LIBS` is passed as-is, and
`LDFLAGS`, `LIBS` are the canonical way to pass custom libs options
to a build. `LIBS` may not work without a matching custom libpath.

This brings autotools behaviour closer to cmake, and `curl-config`
closer to `libcurl.pc`.

Follow-up to 9f56bb608ecfbb8978c6cb72a04d9e8b23162d82 #14681
Follow-up to 4c8adc8fee5e55754da3d8f8d982733a7bf3dece
Reported-by: Peter Marko
Fixes #15533
Closes #15550

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configure: catch Apple in more target triplets

Before this patch, only these triplets were considered Apple:
`<cpu>-apple-darwin`

After this patch, these are also considered App

configure: catch Apple in more target triplets

Before this patch, only these triplets were considered Apple:
`<cpu>-apple-darwin`

After this patch, these are also considered Apple:
`<cpu>-apple-(ios*|tvos*|visionos*|watchos*|<ETC>)`

`$host_os` (the last third of the triplet) still has a valid use
to differentiate between OS flavours, though for now this isn't
used, aligning with CMake.

Closes #14728

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configure: fix indentation more

Follow-up to 0052b4b52dfbd6455a24dd95837e5236dc8e1f5d #14628

Closes #14682

configure: fix `SystemConfiguration` detection

Before this patch, `SystemConfiguration` detection failed due to this
error when compiling the detection snippet:
```
/Applications

configure: fix `SystemConfiguration` detection

Before this patch, `SystemConfiguration` detection failed due to this
error when compiling the detection snippet:
```
/Applications/Xcode_15.3.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/TargetConditionals.h:140:50: error: missing binary operator before token "("
140 | #if !defined(__has_extension) || !__has_extension(define_target_os_macros)
| ^
```
Ref: https://github.com/curl/curl/actions/runs/9821817534/job/27117929218#step:6:1079

It occured with gcc-11 when combined with macOS SDK 14.4 and 14.5
(default SDKs in Xcode 15.3 and 15.4 respectively). It did not happen
with earlier releases.

Despite the failure in `./configure`, `lib/macos.c` compiled with
Apple's `TargetConditionals.h` just fine.

Turns out that including the `sys/types.h` header before the SDK
header fixes the error and makes the detection snippet compile.

Cherry-picked from #14097
Closes #14130

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cmake, configure: also link with CoreServices

When linking with CoreFoundation, also link with CoreServices which is
apparently required to avoid an NSInvalidArgumentException in softwar

cmake, configure: also link with CoreServices

When linking with CoreFoundation, also link with CoreServices which is
apparently required to avoid an NSInvalidArgumentException in software
linking with libcurl on macOS Sonoma 14 and later.

Fixes #11893
Closes #11894

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macOS: fix target detection more

Now SCDynamicStoreCopyProxies is called (and the required frameworks are
linked in) on all versions of macOS and only on macOS. Fixes crash due
to un

macOS: fix target detection more

Now SCDynamicStoreCopyProxies is called (and the required frameworks are
linked in) on all versions of macOS and only on macOS. Fixes crash due
to undefined symbol when built with the macOS 10.11 SDK or earlier.

CURL_OSX_CALL_COPYPROXIES is renamed to CURL_MACOS_CALL_COPYPROXIES and
is now only defined when SCDynamicStoreCopyProxies will actually be
called. Previously, it was defined when ENABLE_IPV6 was not defined but
SCDynamicStoreCopyProxies is not called in that case.

TARGET_OS_OSX is only defined in the macOS 10.12 SDK and later and only
when dynamic targets are enabled. TARGET_OS_MAC is always defined but
means any Mac OS or derivative including macOS, iOS, tvOS, and watchOS.
TARGET_OS_IPHONE means any Darwin OS other than macOS.

Follow-up to c73b2f82

Fixes #11502
Closes #11516

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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hostip: (macOS) free returned memory of SCDynamicStoreCopyProxies

From Apples documentation on SCDynamicStoreCopyProxies, "Return Value: A
dictionary of key-value pairs that represent th

hostip: (macOS) free returned memory of SCDynamicStoreCopyProxies

From Apples documentation on SCDynamicStoreCopyProxies, "Return Value: A
dictionary of key-value pairs that represent the current internet proxy
settings, or NULL if no proxy settings have been defined or if an error
occurred. You must release the returned value."

Failure to release the returned value of SCDynamicStoreCopyProxies can
result in a memory leak.

Source: https://developer.apple.com/documentation/systemconfiguration/1517088-scdynamicstorecopyproxies

Closes #7265

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lib/hostip6.c: make NAT64 address synthesis on macOS work

Closes #7121