add android build scripts

build_sdl_android.sh

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+swift build -Xcc -I3rdparty/bgfx/3rdparty/khronos \
+-Xcc -I3rdparty/bx/include -Xcc -I3rdparty/bgfx/3rdparty \
+-Xlinker -L3rdparty/bgfx/.build/android-arm/bin \
+-Xswiftc -target -Xswiftc armv7-none-linux-androideabi \
+-Xswiftc -sdk -Xswiftc $ANDROID_NDK_HOME/platforms/android-21/arch-arm \
+-Xlinker -L$ANDROID_NDK_HOME/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a \
+-Xlinker -L$ANDROID_NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/ \
+-Xlinker -L$ANDROID_NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/arm-linux-androideabi/lib/armv7-a/ \
+-Xswiftc -DNOSIMD \
+-Xlinker -lbgfxDebug -Xlinker -lgcc -Xlinker -lc++ -Xlinker -ldispatch -Xlinker -lFoundation -Xlinker -latomic -Xlinker -lEGL -Xlinker -lGLESv2 -Xlinker -llog \
+-Xswiftc -I/home/s1ddok/Documents/swift/build/Ninja-ReleaseAssert/foundation-linux-x86_64/Foundation \
+-Xswiftc -I/home/s1ddok/Documents/swift/swift-corelibs-foundation \
+-Xswiftc -I/home/s1ddok/Documents/swift/swift-corelibs-foundation/closure \
+-Xlinker -L/usr/local/lib/swift/android/ \
+-Xlinker -L/home/s1ddok/Documents/swift/build/Ninja-ReleaseAssert/foundation-linux-x86_64/Foundation/

prepare_bgfx_android.sh

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+export ANDROID_NDK_ROOT=$ANDROID_NDK_HOME
+export ANDROID_NDK_ARM=$ANDROID_NDK_ROOT/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
+# MIPS and x86 android are not supported at the moment
+#export ANDROID_NDK_MIPS=$ANDROID_NDK_ROOT/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64
+#export ANDROID_NDK_X86=$ANDROID_NDK_ROOT/toolchains/x86-4.9/prebuilt/linux-x86_64
+#export CXXFLAGS="--stl=libc++"
+#export CXX="$ANDROID_NDK_ROOT/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-clang++"
+cd 3rdparty/bgfx
+make
+make android-arm
+#& make android-mips & make android-x86