[glib] build: Ensure user-set CFLAGS override defaults

[Colin Walters <walters src gnome org>]

commit 0864e3bd6fc17bab3f60b6f0e240efb44b6b5d43
Author: Henrique Dante de Almeida <hdante gmail com>
Date:   Sun Jan 13 12:58:12 2013 -0200

    build: Ensure user-set CFLAGS override defaults
    
    For example, the user should be able disable our default -Werror
    settings.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=691608

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b7d5d45..5cb21df 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3573,7 +3573,7 @@ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
    -Werror=missing-prototypes -Werror=implicit-function-declaration \
    -Werror=pointer-arith -Werror=init-self -Werror=format-security \
    -Werror=format=2 -Werror=missing-include-dirs])
-CFLAGS="$CFLAGS $with_cflags"
+CFLAGS="$with_cflags $CFLAGS"
 
 #
 # Define variables corresponding to the correct include paths to use for