add fbcode_builder manifest

Summary: Add a manifest and CMakeLists.txt for building fb303 with cmake.

Reviewed By: wez

Differential Revision: D15480895

fbshipit-source-id: d47f6ef9b9383b79b31a6170c7d4c9e8337de4d8

build/fbcode_builder/manifests/fb303

+[manifest]
+name = fb303
+fbsource_path = fbcode/fb303
+shipit_project = fb303
+shipit_fbcode_builder = true
+
+[git]
+repo_url = https://github.com/facebookincubator/fb303.git
+
+[build]
+builder = cmake
+
+[dependencies]
+folly
+gflags
+glog
+fbthrift
+
+[cmake.defines.test=on]
+BUILD_TESTS=ON
+
+[cmake.defines.test=off]
+BUILD_TESTS=OFF
+
+[shipit.pathmap]
+fbcode/fb303/github = .
+fbcode/fb303 = fb303