Follow up to r1812263. As suggested by Joe, add --maintainer/debugger-mode's CFLAGS in NOTEST_CFLAGS to avoid interractions with autoconf's AC_LANG_PROGRAM. APACHE_ADD_GCC_CFLAG now also forces -Wno-strict-prototypes for -Werror to work despite AC_LANG_PROGRAM generating this warning by itself.
httpd/httpd/trunk/acinclude.m4
httpd/httpd/trunk/configure.in