enable tests in getdeps

Summary: also always install fizz test headers for mvfst and proxygen tests to consume without needing to build fizz tests

Reviewed By: yfeldblum

Differential Revision: D23676344

fbshipit-source-id: 7ae78c81c2d67bb8da135fcd69d4be119b50a27e

build/fbcode_builder/manifests/fizz

@@ -13,11 +13,18 @@ subdir = fizz
 
 [cmake.defines]
 BUILD_EXAMPLES = OFF
+
+[cmake.defines.test=on]
+BUILD_TESTS = ON
+
+[cmake.defines.test=off]
 BUILD_TESTS = OFF
 
+
 [dependencies]
 folly
 libsodium
+googletest_1_8
 
 [shipit.pathmap]
 fbcode/fizz/public_tld = .