Remove extension from LOCAL_MODULE_STEM

LOCAL_MODULE_STEM adds the expected extension to the installation path,
remove the extension from the filename.

Change-Id: I54dbcfa73d8d07fc3630caf2d582160003e28f79
(cherry picked from commit bf305dea81d301bee644416b325196bb68bd4878)
diff --git a/cc/androidmk.go b/cc/androidmk.go
index 8b1b349..af8347a 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -115,8 +115,10 @@
 func (installer *baseInstaller) AndroidMk(ret *common.AndroidMkData) {
 	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile common.Path) error {
 		path := installer.path.RelPathString()
-		fmt.Fprintln(w, "LOCAL_MODULE_PATH := $(OUT_DIR)/"+filepath.Dir(path))
-		fmt.Fprintln(w, "LOCAL_MODULE_STEM := "+filepath.Base(path))
+		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_STEM := "+stem)
 		return nil
 	})
 }