Bug 1581762 - Make gTests work on Mac. r=me

mail/app/macbuild/Contents/MacOS-files.in

@@ -1,6 +1,7 @@
 /*.app/***
 /certutil
 /thunderbird-bin
+/gtest/***
 #if defined(MOZ_CRASHREPORTER)
 /minidump-analyzer
 #endif

taskcluster/ci/test/compiled.yml

@@ -24,9 +24,6 @@ gtest:
     suite: gtest
     treeherder-symbol: GTest
     instance-size: xlarge
-    run-on-projects:
-        by-test-platform:
-            macosx1014-.*: []  # currently fails on macOS
-            default: built-projects
+    run-on-projects: built-projects
     target: null
     tier: default