Don't specify -arch and -m{}os-version-min= on Apple platforms

[madsmtm]

As recommended by Clang developers in llvm/llvm-project#88271 (comment), we already specify --target, and that should be enough.

Related: #1029, the -mxros-version-min/-mvisionos-version-min option does not exist.

CC @BlackHoleFox.

[NobodyXu]

sounds good to me, IIRC specifying version-min might be related to errors in other projects using cc, maybe even rustc bootstrap, which failed to compile llvm.

[BlackHoleFox]

Yeah ditching it seems like a fine option. Only thought is maybe compatibility with old (whatever matches 10.12) XCode versions but that might not be a real issue since there is no reason to build iOS (and derivative) apps with anything except the last N-2 XCode releases for app store reasons.

Would the idea be to remove use of -m{}os-version-min and -arch everywhere except macOS?

[QuentinPerez]

Maybe platform_version, it seems to support visionos.

     -platform_version platform min_version sdk_version
             This is set to indicate the platform, oldest supported version of that platform that output is to be used on, and the SDK that the output was
             built against.  platform is a numeric value as defined in <mach-o/loader.h>, or it may be one of the following strings:
             • macos
             • ios
             • tvos
             • watchos
             • bridgeos
             • visionos
             • xros
             • mac-catalyst
             • ios-simulator
             • tvos-simulator
             • watchos-simulator
             • visionos-simulator
             • xros-simulator
             • driverkit
             Specifying a newer min or SDK version enables the linker to assume features of that OS or SDK in the output file. The format of min_version
             and sdk_version is a version number such as 10.13 or 10.14