Use `LOCAL_EXPORT_C_INCLUDES` to manage include paths.

Better than hardcoding the include path in LOVE Android.mk

love/src/jni/love/Android.mk

@@ -25,7 +25,6 @@ LOCAL_C_INCLUDES  :=  \
 	${LOCAL_PATH}/src/libraries/physfs \
 	${LOCAL_PATH}/src/libraries/glslang/glslang/Include \
 	${LOCAL_PATH}/../SDL2-2.0.9/include \
-	${LOCAL_PATH}/../openal-soft-1.19.1/include \
 	${LOCAL_PATH}/../freetype2-android/include \
 	${LOCAL_PATH}/../freetype2-android/src \
 	${LOCAL_PATH}/../mpg123-1.17.0/src/libmpg123 \

love/src/jni/openal-soft-1.19.1/Android.mk

@@ -52,6 +52,7 @@ LOCAL_C_INCLUDES := \
 	$(LOCAL_PATH)/common \
 	$(LOCAL_PATH)/Alc \
 	$(LOCAL_PATH)/OpenAL32/Include
+LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
 
 LOCAL_SRC_FILES := \
 	common/alcomplex.c \