git-compat-util.h: support variadic macros with the XL C compiler
When the XL C compiler is run with an appropriate language level or suboption, it defines a feature test macro to indicate support for variadic macros by defining __C99_MACRO_WITH_VA_ARGS C preprocessor macro. This was tested on z/OS, but it should also work on AIX according to IBM documentation. Signed-off-by: NDavid Michael <fedora.dm0@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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