configure: run AX_PROG_CC_FOR_BUILD before AM_PROG_CC_C_O.
It was working fine for me, but someone had the error: error: AC_PROG_CC cannot be called after AM_PROG_CC_C_O /usr/share/aclocal/ax_prog_cc_for_build.m4:38: AX_PROG_CC_FOR_BUILD is expanded from... I can indeed see that AX_PROG_CC_FOR_BUILD code runs AC_PROG_CC again. So let's make sure this is run before AM_PROG_CC_C_O. Thanks to Francesco Riosa for reporting the bug.
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