Quell warnings for exclusion list dictionaries in MSVS generator.

Quell warnings for exclusion list dictionaries in MSVS generator.

When using ! or / filtering mechanisms on MSVS tool dictionaries, the resulting automatically created exclusion list dictionary causes the generator to complain that the setting name is unknown. This silences these spurious warnings.

R=scottmg@chromium.org

Committed: https://code.google.com/p/gyp/source/detail?r=1845

[chrisha, 2014-01-24 20:09:41]

PTAL

[scottmg, 2014-01-24 20:24:23]

lgtm

[chrisha, 2014-01-24 20:26:25]

Thanks, committing.

[chrisha, 2014-01-24 20:40:14]

Committed patchset #1 manually as r1845 (presubmit successful).