add spec for re2

Reviewed By: saifhhasan

Differential Revision: D7943135

fbshipit-source-id: 6b66b7b2ea6343b99ec113febca991eb840b1860

build/fbcode_builder/specs/re2.py

+#!/usr/bin/env python
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+
+def fbcode_builder_spec(builder):
+    return {
+        'steps': [
+            builder.github_project_workdir('google/re2', 'build'),
+            builder.cmake_install('google/re2'),
+        ],
+    }