Support Rust in native-bridge

Bug: 178565008
Bug: 165791368
Test: Build and link a Rust library into a native-bridge binary
Change-Id: I3546571530529203d9dbfd62777f20de18c6bd51
diff --git a/cc/androidmk.go b/cc/androidmk.go
index 1f08a01..4862157 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -24,7 +24,7 @@
 )
 
 var (
-	nativeBridgeSuffix  = ".native_bridge"
+	NativeBridgeSuffix  = ".native_bridge"
 	ProductSuffix       = ".product"
 	VendorSuffix        = ".vendor"
 	ramdiskSuffix       = ".ramdisk"
@@ -182,7 +182,7 @@
 	if ctx.Target().NativeBridge == android.NativeBridgeEnabled {
 		var result []string
 		for _, override := range overrides {
-			result = append(result, override+nativeBridgeSuffix)
+			result = append(result, override+NativeBridgeSuffix)
 		}
 		return result
 	}