PHPC-183: Add -Wdeclaration-after-statement to --enable-developers-flags

Author: bjori

config.m4

@@ -134,6 +134,7 @@ if test "$PHONGO" != "no"; then
     PHP_CHECK_GCC_ARG(-Wenum-compare,                   _MAINTAINER_CFLAGS="$_MAINTAINER_CFLAGS -Wenum-compare")
     PHP_CHECK_GCC_ARG(-Wempty-body,                     _MAINTAINER_CFLAGS="$_MAINTAINER_CFLAGS -Wempty-body")
     PHP_CHECK_GCC_ARG(-Wparentheses,                    _MAINTAINER_CFLAGS="$_MAINTAINER_CFLAGS -Wparentheses")
+    PHP_CHECK_GCC_ARG(-Wdeclaration-after-statement,    _MAINTAINER_CFLAGS="$_MAINTAINER_CFLAGS -Wdeclaration-after-statement")
 
 
     MAINTAINER_CFLAGS="-Wextra $_MAINTAINER_CFLAGS  -Wno-unused-parameter -Wno-unused-but-set-variable -Wno-missing-field-initializers"