Skip TestDex2oatToolDeps on Darwin.

This fixes https://r.android.com/1711292.

Cherry-picked from https://r.android.com/1713990.

Test: m nothing
Bug: 188647117
Bug: 145934348
Bug: 172480615
Change-Id: I0c80b546a814d799562f374148eae5ca23b0e1f8
Merged-In: I0c80b546a814d799562f374148eae5ca23b0e1f8
diff --git a/java/dexpreopt_test.go b/java/dexpreopt_test.go
index f065534..b25dece 100644
--- a/java/dexpreopt_test.go
+++ b/java/dexpreopt_test.go
@@ -173,6 +173,11 @@
 }
 
 func TestDex2oatToolDeps(t *testing.T) {
+	if android.BuildOs != android.Linux {
+		// The host binary paths checked below are build OS dependent.
+		t.Skipf("Unsupported build OS %s", android.BuildOs)
+	}
+
 	preparers := android.GroupFixturePreparers(
 		cc.PrepareForTestWithCcDefaultModules,
 		PrepareForTestWithJavaDefaultModulesWithoutFakeDex2oatd,