Add compatibility define for PHP_CHECK_GCC_ARG

This defines the m4 macro, but makes it always error.

Author: nikic

build/php.m4

@@ -304,6 +304,10 @@ if test "$PHP_RPATH" = "no"; then
 fi
 ])
 
+AC_DEFUN([PHP_CHECK_GCC_ARG],[
+  AC_MSG_ERROR([Use AX_CHECK_COMPILE_FLAG instead])
+])
+
 dnl
 dnl PHP_LIBGCC_LIBPATH(gcc)
 dnl