Enable gold-sb build during pnacl TC build. Also: * print install paths in several banners * enable -Werror for sandboxed gold build    Note, we only do this for gold not for libiberty    which would require additional fixes. 
Enable gold-sb build during pnacl TC build.
Also:
* print install paths in several banners
* enable -Werror for sandboxed gold build
   Note, we only do this for gold not for libiberty
   which would require additional fixes. 

TESTS= manual
BUG= http://code.google.com/p/nativeclient/issues/detail?id=2738
Review URL: https://chromiumcodereview.appspot.com/10151024

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@8396 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client