Flag to enable jpg support

Builder using a custom theme may have need for this.  Add a flag to
easily enable jpg support.

Change-Id: Ica74f8cb1312d3193105f2201a5cf8073e2edc82

minuitwrp/Android.mk

@@ -58,7 +58,11 @@ LOCAL_C_INCLUDES += \
     external/freetype/include \
     external/libcxx/include
 
-#external/jpeg \
+ifneq ($(TW_INCLUDE_JPEG),)
+    LOCAL_C_INCLUDES += \
+        external/jpeg
+    LOCAL_CFLAGS += -DTW_INCLUDE_JPEG
+endif
 
 ifeq ($(RECOVERY_TOUCHSCREEN_SWAP_XY), true)
 LOCAL_CFLAGS += -DRECOVERY_TOUCHSCREEN_SWAP_XY
@@ -169,7 +173,9 @@ LOCAL_CLANG := true
 
 LOCAL_CFLAGS += -DTWRES=\"$(TWRES_PATH)\"
 LOCAL_SHARED_LIBRARIES += libft2 libz libc libcutils libpng libutils
-#libjpeg
+ifneq ($(TW_INCLUDE_JPEG),)
+    LOCAL_SHARED_LIBRARIES += libjpeg
+endif
 LOCAL_STATIC_LIBRARIES += libpixelflinger_twrp
 LOCAL_MODULE_TAGS := eng
 LOCAL_MODULE := libminuitwrp

prebuilt/Android.mk

@@ -122,7 +122,9 @@ ifeq ($(TARGET_USERIMAGES_USE_EXT4), true)
     RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libext4_utils.so
 endif
 RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libaosprecovery.so
-#RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libjpeg.so
+ifneq ($(TW_INCLUDE_JPEG),)
+    RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libjpeg.so
+endif
 ifeq ($(TWHAVE_SELINUX), true)
     RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libselinux.so
     ifneq ($(TARGET_USERIMAGES_USE_EXT4), true)