[cogl/cogl-1.20] build: Drop -Werror for cast-align warnings

[Emmanuele Bassi <ebassi src gnome org>]

commit eaf816f46b8d12cfa523b39ba4e7e49b69cfba32
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Jun 10 17:51:03 2015 +0100

    build: Drop -Werror for cast-align warnings
    
    It seems we really suck at that, or clang is really strict.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=750725

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b923247..0a0e81e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -371,7 +371,7 @@ AC_ARG_ENABLE(
   enable_maintainer_flags=maintainer_default
 )
 
-MAINTAINER_COMPILER_FLAGS="-Wall -Werror=cast-align -Wformat -Wformat-security
+MAINTAINER_COMPILER_FLAGS="-Wall -Wcast-align -Wformat -Wformat-security
                            -Werror=uninitialized -Werror=no-strict-aliasing
                            -Werror=empty-body -Werror=init-self -Werror=undef
                            -Werror=declaration-after-statement -Werror=vla