add mtp responder to TWRP.
Big thanks to Dees_Troy for helping with the implementation.

Change-Id: I6c9c522b9c9de5dc139e2ecb0141008182ba07f0
diff --git a/gui/Android.mk b/gui/Android.mk
index b172b2b..3e499ab 100644
--- a/gui/Android.mk
+++ b/gui/Android.mk
@@ -62,7 +62,7 @@
 ifeq ($(HAVE_SELINUX), true)
 LOCAL_CFLAGS += -DHAVE_SELINUX
 endif
-ifeq ($(TW_OEM_BUILD),true)
+ifeq ($(TW_OEM_BUILD), true)
     LOCAL_CFLAGS += -DTW_OEM_BUILD
 endif