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configure.ac: use AC_PROG_CC_C99

O H requested to merge (removed):C99 into master

Various parts of Xfce, and libraries used by Xfce, already use C99 features. Therefore it is reasonable to expect the availibility of a capable compiler. Current GCC releases silently default to newer C standards, starting with gcc-5 which defaults to C11.

Replace AC_PROG_CC with AC_PROG_CC_C99 to switch the discovered, or specified, compiler to C99.

Signed-off-by: Olaf Hering olaf@aepfle.de

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