Use variables for toolchain lib/include dirs in untrusted.gypi Also add irt variants to newlib and glibc. This will allow us to make the definitions of extra_deps that use these paths on the Chrome side (native_client.gyp and ppapi_untrusted.gyp) use the variables instead, and allow the IRT build to use a separate lib dir, controllable from the nacl side. Also remove unused lib_dirs variables.
Use variables for toolchain lib/include dirs in untrusted.gypi
Also add irt variants to newlib and glibc.
This will allow us to make the definitions of extra_deps that use these
paths on the Chrome side (native_client.gyp and ppapi_untrusted.gyp)
use the variables instead, and allow the IRT build to use a separate
lib dir, controllable from the nacl side.
Also remove unused lib_dirs variables.

R=bradnelson@google.com
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3577

Review URL: https://codereview.chromium.org/21624003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11912 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client