libretro: jni: Add android jni makefiles

build/jni/Android.mk

+LOCAL_PATH := $(call my-dir)
+
+CORE_DIR := $(LOCAL_PATH)/../..
+
+INCLUDES    :=
+SOURCES_C   :=
+SOURCES_CXX :=
+
+include $(CORE_DIR)/build/Makefile.common
+SOURCES_C := $(filter-out %/version.c, $(SOURCES_C))
+
+COREFLAGS := -D__LIBRETRO__ $(RETRODEFS) $(INCLUDES)
+
+GIT_VERSION := " $(shell git rev-parse --short HEAD || echo unknown)"
+ifneq ($(GIT_VERSION)," unknown")
+  COREFLAGS += -DGIT_VERSION=\"$(GIT_VERSION)\"
+endif
+
+include $(CLEAR_VARS)
+LOCAL_MODULE    := retro
+LOCAL_SRC_FILES := $(SOURCES_C) $(SOURCES_CXX)
+LOCAL_CPPFLAGS  := -std=c++11 $(COREFLAGS)
+LOCAL_CFLAGS    := $(COREFLAGS)
+LOCAL_LDFLAGS   := -Wl,-version-script=$(CORE_DIR)/build/link.T
+include $(BUILD_SHARED_LIBRARY)

build/jni/Application.mk

+APP_ABI := all
+APP_STL := c++_static