Supports column numbers in Bazel warning rewriter.
Supports column numbers in Bazel warning rewriter.

Previously Bazel warning messages with column numbers would not b
rewritten and would be treated as errors in Xcode.

e.g.,
WARNING: /path/to/file.mm:23:4: This is a warning.

will now properly be rewritten to:

/path/to/file.mm:23:4: warning This is a warning.

--
MOS_MIGRATED_REVID=121299183

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