Build: Add a comment that AC_PROG_CC_C99 is needed for Autoconf 2.69.
It's obsolete in Autoconf >= 2.70 and just an alias for AC_PROG_CC but Autoconf 2.69 requires AC_PROG_CC_C99 to get a C99 compiler.
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@ -602,6 +602,9 @@ echo "Initializing Automake:"
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AM_INIT_AUTOMAKE([1.12 foreign tar-v7 filename-length-max=99 -Wno-unsupported])
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AC_PROG_LN_S
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dnl # Autoconf >= 2.70 warns that AC_PROG_CC_C99 is obsolete. However,
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dnl # we have to keep using AC_PROG_CC_C99 instead of AC_PROG_CC
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dnl # as long as we try to be compatible with Autoconf 2.69.
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AC_PROG_CC_C99
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if test x$ac_cv_prog_cc_c99 = xno ; then
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AC_MSG_ERROR([No C99 compiler was found.])
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