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configure: Avoid deprecated AC_PROG_CC_C99 if possible.
autoconf 2.70 deprecated the AC_PROG_CC_C99 macro and the AC_PROG_CC was recommended for use instead. However, older versions of that suggested macro do not attempt enabling C99, so it is not a direct replacement. Autoconf 2.69 and older are still widely used in many distributions. Another difference is that AC_PROG_CC attempts to enable C11 in new versions of autoconf. But since we have CI jobs that check -std=c99 builds now, we can afford enabling C11 by default without risking compatibility issues. Fix a deprecation warning by using a new AC_PROG_CC macro with autoconf 2.70+. AC_PROG_CC and AC_PROG_CC_C99 seems to produce the same configuration script in autoconf 2.70+ anyway, so we're already kind of using a new macro on systems with a new autoconf. Acked-by: Eelco Chaudron <[email protected]> Signed-off-by: Ilya Maximets <[email protected]>
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