enable tests when tests requested on unix

Summary:
we weren't setting the cmake test flag when tests requested from getdeps

enable it for the unix platforms only to limit noise for the teams

Reviewed By: bigfootjon

Differential Revision: D89288693

fbshipit-source-id: 35063494fcf6f0d0f34a1cbda5a0719173f49684

Author: ahornby

build/fbcode_builder/manifests/fbthrift

@@ -17,6 +17,12 @@ fbthrift = thrift/lib/rust
 builder = cmake
 job_weight_mib = 2048
 
+[cmake.defines.all(not(os=windows),test=on)]
+enable_tests=ON
+
+[cmake.defines.any(os=windows,test=off)]
+enable_tests=OFF
+
 [dependencies]
 fizz
 fmt