Add an additional build dir to look for pyauto libs on win
Add an additional build dir to look for pyauto libs on win

The upcoming chromium pyauto bots build in src/build/Release. Add it to the
list of locations where pyauto looks for binaries.

BUG=
TEST=

Review URL: http://codereview.chromium.org/3963009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@63785 0039d316-1c4b-4281-b951-d872f2087c98

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