gcc12 not building on macOS 15 aarch64 (gfortran woes)

[Greg Troxel <gdt%lexort.com@localhost>]

Some data points (pkgsrc-2024Q4 with mk/ and lang/ at -current):

macOS 10.13 x86_64: OK: 9 10 12 13. FAIL: 14
macOS 13 x86_64: FAIL: 7 8 9. OK: 10 12 13 14 
macOS 15 x86_64: [will run tests tomorrow]

It would be useful for you to update to current and try 13 again; it
seems ok patch-wise in cvs.

Also, can anyone test on macOS 15 aarch64, or with older macOS versions?
(I realize "stuck on X" has probably not yet arrived with aarch64 macs -
but surely that's coming soon.)



This is making me lean to requiring 14 for the macos/aarch64 case,
leaving macos/x86-64 at 12, and also hoping someone fixes 12 or the
apple toolchain, whichever is buggy.

(I remember that we have precedents where aarch64 needs newer versions.)