Disable -Werror when building gdb with arm-nacl-gcc
Disable -Werror when building gdb with arm-nacl-gcc

The new version of the compiler generates some new
warnings.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4000
R=mcgrathr@chromium.org

Review URL: https://codereview.chromium.org/748173002

Schibum/naclports,yeyus/naclports,Schibum/naclports,Schibum/naclports,Schibum/naclports,Schibum/naclports,yeyus/naclports,yeyus/naclports,Schibum/naclports,yeyus/naclports,yeyus/naclports,yeyus/naclports