Fix some module tags

There is no LOCAL_MODULES_TAGS. Fix by combining with LOCAL_MODULE_TAGS.

Change-Id: I1cacef2f8123af3632ff6a52aa62c2f2e15ac37d
diff --git a/pigz/Android.mk b/pigz/Android.mk
index 7a5a4ee..9b9313d 100644
--- a/pigz/Android.mk
+++ b/pigz/Android.mk
@@ -3,11 +3,10 @@
 include $(CLEAR_VARS)
 
 LOCAL_MODULE := pigz
-LOCAL_MODULE_TAGS := eng
+LOCAL_MODULE_TAGS := eng optional
 LOCAL_MODULE_CLASS := RECOVERY_EXECUTABLES
 LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/sbin
-LOCAL_MODULES_TAGS = optional
-LOCAL_CFLAGS = 
+LOCAL_CFLAGS :=
 LOCAL_SRC_FILES = pigz.c yarn.c
 LOCAL_C_INCLUDES += $(LOCAL_PATH) \
 					external/zlib