[cogl/cogl-1.20] build: Use -Werror for some compiler warnings

[Emmanuele Bassi <ebassi src gnome org>]

commit 2c054aaaaa49c3b71e2735ef1365f51a484091fc
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Jun 10 15:32:18 2015 +0100

    build: Use -Werror for some compiler warnings
    
    We care especially about the violations of C89, for portability on some
    compilers.

 configure.ac |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 72d3ffd..b923247 100644
--- a/configure.ac
+++ b/configure.ac
@@ -371,11 +371,11 @@ AC_ARG_ENABLE(
   enable_maintainer_flags=maintainer_default
 )
 
-MAINTAINER_COMPILER_FLAGS="-Wall -Wcast-align -Wuninitialized
-                           -Wno-strict-aliasing -Wempty-body -Wformat
-                           -Wformat-security -Winit-self -Wundef
-                           -Wdeclaration-after-statement -Wvla
-                           -Wpointer-arith -Wmissing-declarations"
+MAINTAINER_COMPILER_FLAGS="-Wall -Werror=cast-align -Wformat -Wformat-security
+                           -Werror=uninitialized -Werror=no-strict-aliasing
+                           -Werror=empty-body -Werror=init-self -Werror=undef
+                           -Werror=declaration-after-statement -Werror=vla
+                           -Werror=pointer-arith -Werror=missing-declarations"
 
 AS_CASE(
   [$enable_maintainer_flags],