Replace RE2 import with a dependency

third_party/re2/README

Index: third_party/re2/README
diff --git a/third_party/re2/README b/third_party/re2/README
deleted file mode 100644
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-This is the source code repository for RE2, a regular expression library.
-
-For documentation about how to install and use RE2,
-visit https://github.com/google/re2/.
-
-The short version is:
-
-make
-make test
-make install
-make testinstall
-
-More information can be found on the wiki:
-https://github.com/google/re2/wiki
-
-Issue tracker:
-https://github.com/google/re2/issues
-
-Mailing list:
-https://groups.google.com/group/re2-dev
-
-Unless otherwise noted, the RE2 source files are distributed
-under the BSD-style license found in the LICENSE file.
-
-RE2's native language is C++.
-An Erlang wrapper is at https://github.com/tuncer/re2/.
-An Inferno wrapper is at https://github.com/powerman/inferno-re2/.
-A Node.js wrapper is at https://github.com/uhop/node-re2/ and on NPM.
-An OCaml wrapper is at https://github.com/janestreet/re2/ and on OPAM.
-A Perl wrapper is at https://github.com/dgl/re-engine-RE2/ and on CPAN.
-A Python wrapper is at https://github.com/facebook/pyre2/.
-A Ruby wrapper is at https://github.com/axic/rre2/.