Make suppressions path configurable.
Make suppressions path configurable.

We need this since we want to lint WebRTC Android java code, but we
want to be able to use different settings and suppressions.

The only problem with this is that the printed lint warning will
reference suppress.py, which has a hard-coded suppressions path.
I can make that configurable too in a separate patch; it's acceptable
to mention the script for now.

See https://codereview.webrtc.org/1412673008/ (libjingle.gyp)
to see how this will be used.

BUG=webrtc:5063

Review URL: https://codereview.chromium.org/1432553009

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#359091}

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