Correct isThirdParty check

Previously, isThirdParty check was over-selecting for third-party-ness,
the only non-third-party paths were those explicitly excluded from
typically third party directories, results in ~all code being considered
third party.

Updated test to ensure bionic is not considered third party, which fails
without this change.

Test: go soong tests
Change-Id: Id371aaad2ceef2b3163384fa84712397877cbe90

cc/compiler.go

@@ -692,8 +692,9 @@ func isThirdParty(path string) bool {
 				return false
 			}
 		}
+		return true
 	}
-	return true
+	return false
 }
 
 // Properties for rust_bindgen related to generating rust bindings.