Fixes red gypbot at r1297. gyp-win32 failing on this test on some VMs but not others (yuck!).
Fixes red gypbot at r1297. gyp-win32 failing on this test on some VMs but not others (yuck!).

The root cause is that there's something slightly broken in dependency checking, either in ninja or (maybe more likely?) in the accuracy of the timestamps when relocate()ing source trees on the VMs that break.

This test shouldn't ever actually need to execute its rules (the outputs aren't actually output from a tool; there's no command line that's actually run). As such, the msvs_cygwin_dirs wasn't even specified in the test. So when the dependency check fails and the tool is run, the cygwin setup script is run an has the wrong path, so the test fails.

This patch simply specifies the correct path to cygwin, so that if it *does* run, it works correctly (and does nothing).

Future further investigation required to determine whether ninja or the VM or is actually at fault.

Review URL: https://chromiumcodereview.appspot.com/9958090
witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp