Add -Wmaybe-uninitialized to developer flags

Author: derickr

config.m4

@@ -127,6 +127,7 @@ if test "$MONGODB" != "no"; then
     PHP_CHECK_GCC_ARG(-Wempty-body,                     _MAINTAINER_CFLAGS="$_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")
+    PHP_CHECK_GCC_ARG(-Wmaybe-uninitialized,            _MAINTAINER_CFLAGS="$_MAINTAINER_CFLAGS -Wmaybe-uninitialized")
     PHP_CHECK_GCC_ARG(-Werror,                          _MAINTAINER_CFLAGS="$_MAINTAINER_CFLAGS -Werror")
     PHP_CHECK_GCC_ARG(-Wextra,                          _MAINTAINER_CFLAGS="$_MAINTAINER_CFLAGS -Wextra")
     PHP_CHECK_GCC_ARG(-Wno-unused-parameter,            _MAINTAINER_CFLAGS="$_MAINTAINER_CFLAGS -Wno-unused-parameter")