Reinstate -Werror for GCC2
Reinstate -Werror for GCC2

svn path=/trunk/libcss/; revision=9019

prepare/netsurf_libcss,prepare/netsurf_libcss,zhuyadong/libcss,servo/libcss,zhuyadong/libcss,servo/libcss,servo/libcss,zhuyadong/libcss,prepare/netsurf_libcss