Revert "Fix: sanitizerRuntimeMutator is not run for host"

This reverts commit 1c29b0e6ec3faf3b560335444c39f026cd212622.

Reason for revert: Broke aosp_x86_64

Change-Id: I581200f1c271c3e1a39d5cdad84c782977b13054
diff --git a/cc/sanitize.go b/cc/sanitize.go
index 162e22e..d19e54a 100644
--- a/cc/sanitize.go
+++ b/cc/sanitize.go
@@ -667,10 +667,10 @@
 
 // Add the dependency to the runtime library for each of the sanitizer variants
 func sanitizerRuntimeMutator(mctx android.BottomUpMutatorContext) {
+	if mctx.Os() != android.Android {
+		return
+	}
 	if c, ok := mctx.Module().(*Module); ok && c.sanitize != nil {
-		if !c.Enabled() {
-			return
-		}
 		var sanitizers []string
 		var diagSanitizers []string