toolchain_build: Update newlib revision
toolchain_build: Update newlib revision

This brings in:

5feee65 newlib: Don't use -fshort-enums

BUG= http://code.google.com/p/nativeclient/issues/detail?id=3193
TEST= trybot

R=sehr@google.com

Review URL: https://codereview.chromium.org/11476029

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@10410 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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