Aleksandr Mezin 2b9bf7b162 gmacros.h: use g_macro__has_attribute() where possible
Fall back to compiler version checks only when `__has_attribute()` is not
available.

clang-cl doesn't define `__GNU__`, but still accepts attributes. This change
gets rid of a lot of warnings when building GLib with clang-cl. For GCC and
non-cl Clang nothing should change.
2021-04-16 14:45:03 +06:00
..
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