Build block TWRP with RECOVERY_VARIANT

Enable TWRP to reside alongside other recoveries with the naming
convention: bootable/recovery(-flag). If TWRP resides at
bootable/recovery and a device does not specify RECOVERY_VARIANT, then
it will build like normal. If TWRP resides at bootable/recovery-twrp,
then its makefiles will only be parsed if a device specifies
'RECOVERY_VARIANT := twrp'. This prevents TWRP specific makefile
warnings/errors (notably, missing DEVICE_RESOLUTION) when another
recovery is being built.

Change-Id: I8f02fffcd79c309c7123b9428eedc69af02e126e
diff --git a/libmincrypt/Android.mk b/libmincrypt/Android.mk
index c111f4b..1c21324 100644
--- a/libmincrypt/Android.mk
+++ b/libmincrypt/Android.mk
@@ -4,7 +4,7 @@
 include $(CLEAR_VARS)
 
 LOCAL_MODULE := libmincrypttwrp
-LOCAL_C_INCLUDES := bootable/recovery/libmincrypt/includes
+LOCAL_C_INCLUDES := $(commands_recovery_local_path)/libmincrypt/includes
 LOCAL_SRC_FILES := rsa.c sha.c sha256.c
 include $(BUILD_STATIC_LIBRARY)