Use WhereIs method for compiler names in implicit dependencies hack
Use WhereIs method for compiler names in implicit dependencies hack

SCons provides a better method than a Windows conditional for this.
Use it.

BUG=cleanup
TEST=hand tested on Windows to verify dependency tree

R=bradnelson@google.com,noelallen@google.com

Review URL: http://codereview.chromium.org/7307041

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@5937 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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