Remove trailing / from install path

Prevents make installing files with a double /:
Install: out/target/product/generic_arm64/system/lib//libc.so

Change-Id: Iee237f344e8140c4938aa9d1e6940e4fdbfa7cd8
diff --git a/cc/androidmk.go b/cc/androidmk.go
index 0e790eb..5b160c6 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -119,7 +119,7 @@
 		path := installer.path.RelPathString()
 		dir, file := filepath.Split(path)
 		stem := strings.TrimSuffix(file, filepath.Ext(file))
-		fmt.Fprintln(w, "LOCAL_MODULE_PATH := $(OUT_DIR)/"+dir)
+		fmt.Fprintln(w, "LOCAL_MODULE_PATH := $(OUT_DIR)/"+filepath.Clean(dir))
 		fmt.Fprintln(w, "LOCAL_MODULE_STEM := "+stem)
 		return nil
 	})