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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macOS: fix taget detection

- TARGET_OS_OSX is not always defined on macOS
- this leads to missing symbol Curl_macos_init()
- TargetConditionals.h seems to define these only when

macOS: fix taget detection

- TARGET_OS_OSX is not always defined on macOS
- this leads to missing symbol Curl_macos_init()
- TargetConditionals.h seems to define these only when
dynamic targets are enabled (somewhere?)
- this PR fixes that on my macOS 13.4.1
- I have no clue why CI builds worked without it

Follow-up to c7308592fb8ba213fc2c1
Closes #11417

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hostip.c: Move macOS-specific calls into global init call

https://github.com/curl/curl/pull/7121 introduced a macOS system call
to `SCDynamicStoreCopyProxies`, which is invoked every tim

hostip.c: Move macOS-specific calls into global init call

https://github.com/curl/curl/pull/7121 introduced a macOS system call
to `SCDynamicStoreCopyProxies`, which is invoked every time an IP
address needs to be resolved.

However, this system call is not thread-safe, and macOS will kill the
process if the system call is run first in a fork. To make it possible
for the parent process to call this once and prevent the crash, only
invoke this system call in the global initialization routine.

In addition, this change is beneficial because it:

1. Avoids extra macOS system calls for every IP lookup.
2. Consolidates macOS-specific initialization in a separate file.

Fixes #11252
Closes #11254

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