legacy-support provide TARGET_OS_IPHONE

[rmottola (Riccardo)]

I noticed that several ports start "breaking" because of TARGET_OS_IPHONE not being defined. E.g. ​https://github.com/LuaJIT/LuaJIT/pull/1189/files

The fix is incredibly trivial, but upstream often forgets about that. We can fight and make a patch for each and maintain it or hope it is upstreamed. However, often legacy-support is already used. I wonder if there is a good place and way to define it? Of course to 0, NO, or what is needed. We don't need those code sections at all on Mac

[kencu (Ken)]

add here

​https://github.com/macports/macports-legacy-support/blob/master/include/TargetConditionals.h

[fhgwright (Fred Wright)]

In 9ec5a80946508826545c6ed5b1cd828127b65676/macports-legacy-support (master):

TargetConditionals: Add more defaults.

This replaces the old cherry-picked list with a more complete version
taken from the macOS 15 SDK. In the process, it fixes a conflict with
a hack in the AvailabilityMacros.h wrapper.

Closes: #70824

TESTED:
Passes updated test on all platforms, with all applicable SDKs.

[fhgwright (Fred Wright)]

In f51f33e4d1a924693c4c9a0a8089ebc128f54153/macports-ports (master):

legacy-support-devel: Update to latest master.

Notable changes since last -devel version:

• Adds support for code that can't tolerate the normal scandir() fix.
• Limits unavoidable GCC warnings to cases that really need the fix.
• Replaces broken copyfile wrapper with full 10.6 copyfile.
• Extends 10.4 INODE64 support to *statx_np() functions.
• Expands TARGET_* defaults. See: #70824

Also (Portfile only):

• Disables unnecessary compiler_wrapper PG.
• Adds note to update cxx_stdlib comment on next release.
• Cleans up some long lines.

TESTED:
Tested both normal and -devel versions on 10.4-10.5 ppc, 10.5-10.6 ppc
(i386 Rosetta), 10.4-10.6 i386, 10.4-12.x x86_64, and 11.x-15.x arm64.
Builds and passes all tests on all tested platforms.

[fhgwright (Fred Wright)]

In a784d15ced04e75724ee259cec1f7a3d1ab696d3/macports-ports (master):

legacy-support: update to v1.4.0.

Notable changes since v1.3.0:

• Works around Apple's broken versioning in the macOS 15 SDK
• Implements scandir() compatibility feature
• Fixes dprintf() bug and implements vdprintf() See: #67598 See: #70118

• Mismatched SDK compatibility is extended to include 15.x SDK.
• Broken 10.4 CLOCK_MONOTONIC is fixed.

• Fixes stat inconsistency in some 32-bit 10.4 builds.
• Adds stat64 header support for 10.4 SDK.
• Adds INODE64 support for *stat*() on 10.4.
• Reworks fstatat*() support, similar to previous item, fixing buffer overrun in some cases.
• Backports 10.5 'which' to 10.4.

• Adds support for code that can't tolerate the normal scandir() compatibility feature.
• Replaces broken 10.4/10.5 copyfile wrapper with full 10.6 copyfile.
• Extends 10.4 INODE64 support to *statx_np() functions.
• Expands TARGET_* defaults. See: #70824

• Fixes 10.4 Rosetta bug in fstatx_np()
• Makes renameat() available via stdio.h See: #71842
• Implements interim clock_gettime_nsec_np() See: #61691
• Implements clock_settime() See: #71399
• Adds net/if_tun.h for <10.6 See: #70231
• Provides pthread_[f]chdir_np() for 10.5+ See: #71265
• Adds CPU_TYPE_ARM definition for 10.4 See: #71621

TESTED:
Tested both normal and -devel versions -/+universal on 10.4-10.5 ppc,
10.5-10.6 ppc (i386 Rosetta), 10.4-10.6 i386, 10.4-12.x x86_64, and
11.x-15.x arm64.
Builds and passes all tests on all tested platforms.

[mascguy (Christopher Nielsen)]

Recategorize existing legacy-support lib tickets, to use new component definition.