Use prebuilt awk on Darwin too

Test: build on mac
Change-Id: I25d21c0df0b9023d6c43b11dde60e6066f107576

ui/build/path.go

@@ -149,10 +149,8 @@ func SetupPath(ctx Context, config Config) {
 
 	// We put some prebuilts in $PATH, since it's infeasible to add dependencies for all of
 	// them.
-	if runtime.GOOS == "linux" {
-		prebuiltsPath, _ := filepath.Abs("prebuilts/build-tools/path/" + runtime.GOOS + "-x86")
-		myPath = prebuiltsPath + string(os.PathListSeparator) + myPath
-	}
+	prebuiltsPath, _ := filepath.Abs("prebuilts/build-tools/path/" + runtime.GOOS + "-x86")
+	myPath = prebuiltsPath + string(os.PathListSeparator) + myPath
 
 	config.Environment().Set("PATH", myPath)
 	config.pathReplaced = true

ui/build/paths/config.go

@@ -125,9 +125,6 @@ var Configuration = map[string]PathConfig{
 	"ld.gold":    Forbidden,
 	"pkg-config": Forbidden,
 
-	// On Linux we'll use one-true-awk instead.
-	"awk": LinuxOnlyPrebuilt,
-
 	// On Linux we'll use the toybox versions of these instead.
 	"basename":  LinuxOnlyPrebuilt,
 	"cat":       LinuxOnlyPrebuilt,