Remove an input dependency from the pexe -> nexe gyp rule.
Remove an input dependency from the pexe -> nexe gyp rule.

Remove an input dependency on build_nexe.py.  This may affect
incremental builds when build_nexe.py changes, but the rules
aren't really being used right now anyway.

This appears to help remove a warning about a circular dependency
from visual studio:

warning MSB8017: A circular dependency has been detected while executing custom
build commands for item
"..\..\..\..\build\Release\\nacl_test_data\glibc\pm_exit_status_test_glibc_x86_64.nexe".
This may cause incremental build to work incorrectly.

when the following CL is applied: https://codereview.chromium.org/11956028/

Whether or not we will end up using these rules in the first place
can be decided later...

BUG= http://code.google.com/p/nativeclient/issues/detail?id=2484

Review URL: https://codereview.chromium.org/11871030

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@10637 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