build: prefer `USE_IPV6` macro internally (was: `ENABLE_IPV6`)

Before this patch, two macros were used to guard IPv6 features in curl
sources: `ENABLE_IPV6` and `USE_IPV6`. This patch ma

build: prefer `USE_IPV6` macro internally (was: `ENABLE_IPV6`)

Before this patch, two macros were used to guard IPv6 features in curl
sources: `ENABLE_IPV6` and `USE_IPV6`. This patch makes the source use
the latter for consistency with other similar switches.

`-DENABLE_IPV6` remains accepted for compatibility as a synonym for
`-DUSE_IPV6`, when passed to the compiler.

`ENABLE_IPV6` also remains the name of the CMake and `Makefile.vc`
options to control this feature.

Closes #13349

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egd: delete feature detection and related source code

EGD is Entropy Gathering Daemon, a socket-based entropy source supported
by pre-OpenSSL v1.1 versions and now deprecated. curl also

egd: delete feature detection and related source code

EGD is Entropy Gathering Daemon, a socket-based entropy source supported
by pre-OpenSSL v1.1 versions and now deprecated. curl also deprecated it
a while ago.

Its detection in CMake was broken all along because OpenSSL libs were
not linked at the point of feature check.

Delete detection from both cmake and autotools, along with the related
source snippet, and the `--with-egd-socket=` `./configure` option.

Closes #11556

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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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tidy-up: make conditional checks more consistent

... remove '== NULL' and '!= 0'

Closes #6912

curl.se: new home

Closes #6172

copyright: updated year ranges out of sync

... and whitelisted a few more files in the the copyright.pl script.

checksrc: enhance the ASTERISKSPACE and update code accordingly

Fine: "struct hello *world"

Not fine: "struct hello* world" (and variations)

Closes #5386

checksrc: move open braces to comply with function declaration style

checksrc: code style: use 'char *name' style

URLs: change all http:// URLs to https://

openssl: VMS support for SHA256

setup-vms.h: More symbols for SHA256, hacks for older VAX

openssl.h: Use OpenSSL OPENSSL_NO_SHA256 macro to allow building on VAX.

openssl.c

openssl: VMS support for SHA256

setup-vms.h: More symbols for SHA256, hacks for older VAX

openssl.h: Use OpenSSL OPENSSL_NO_SHA256 macro to allow building on VAX.

openssl.c: Use OpenSSL version checks and OPENSSL_NO_SHA256 macro to
allow building on VAX and 64 bit VMS.

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OpenVMS: VMS Software, Inc now the supplier.

setup-vms.h: Symbol case fixups submitted by Michael Steve

build_gnv_curl_pcsi_desc.com: VSI aka as VMS Software, is now the
supplie

OpenVMS: VMS Software, Inc now the supplier.

setup-vms.h: Symbol case fixups submitted by Michael Steve

build_gnv_curl_pcsi_desc.com: VSI aka as VMS Software, is now the
supplier of new versions of VMS. The install kit needs to accept
VSI as a producer.

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checksrc: use space after comma

VMS: Updates for 0740-0D1220

lib/setup-vms.h : VAX HP OpenSSL port is ancient, needs help.
More defines to set symbols to uppercase.

src/tool_main.c : Fix para

VMS: Updates for 0740-0D1220

lib/setup-vms.h : VAX HP OpenSSL port is ancient, needs help.
More defines to set symbols to uppercase.

src/tool_main.c : Fix parameter to vms_special_exit() call.

packages/vms/ :
backup_gnv_curl_src.com : Fix the error message to have the correct package.

build_curl-config_script.com : Rewrite to be more accurate.

build_libcurl_pc.com : Use tool_version.h now.

build_vms.com : Fix to handle lib/vtls directory.

curl_gnv_build_steps.txt : Updated build procedure documentation.

generate_config_vms_h_curl.com :
* VAX does not support 64 bit ints, so no NTLM support for now.
* VAX HP SSL port is ancient, needs some help.
* Disable NGHTTP2 for now, not ported to VMS.
* Disable UNIX_SOCKETS, not available on VMS yet.
* HP GSSAPI port does not have gss_nt_service_name.

gnv_link_curl.com : Update for new curl structure.

pcsi_product_gnv_curl.com : Set up to optionally do a complete build.

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setup-vms.h: sk_pop symbol tweak

Newer versions of curl are referencing a sk_pop symbol while the HP
OpenSSL library has the symbol in uppercase only.

setup-vms.h: post VMS patch cleanup - III

- rename post-config-vms.h to setup-vms.h
- move its inclusion into proper location in curl_setup.h