Make tests work again on Darwin. am: deba72161c

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1614816

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Id671b831f791277e6c5520eb0fa458fa58bdbf41
diff --git a/android/config.go b/android/config.go
index ef5eadf..c10ad09 100644
--- a/android/config.go
+++ b/android/config.go
@@ -232,7 +232,7 @@
 
 	// Copy the real PATH value to the test environment, it's needed by
 	// NonHermeticHostSystemTool() used in x86_darwin_host.go
-	envCopy["PATH"] = originalEnv["PATH"]
+	envCopy["PATH"] = os.Getenv("PATH")
 
 	config := &config{
 		productVariables: productVariables{