watchman: migrate wildmatch test to gtest

Summary: This is the first step towards removing `watchman/thirdparty/tap.{cpp,h}`

Reviewed By: chadaustin

Differential Revision: D17775680

fbshipit-source-id: d6ac32c3b2489e1713fb132b0bb46d848c56811f

build/fbcode_builder/manifests/watchman

@@ -16,6 +16,7 @@ fb303
 fbthrift
 folly
 pcre
+googletest
 
 [shipit.pathmap]
 fbcode/watchman = .