fix(Makefile): workaround for cmake-3.7.1 problem of using clang tool…

…chain

android/ndk#254

opencc crashes when using gcc
build breaks when using clang under cmake-3.7.1

So we should use clang under cmake-3.6 now.

Makefile

@@ -51,12 +51,12 @@ ndk:
 	ndk-build
 
 android:
-	cmake -Bbuild-android \
+	cmake-3.6 -Bbuild-android \
 		-DCMAKE_BUILD_TYPE=Release \
 		-DCMAKE_TOOLCHAIN_FILE=${ANDROID_NDK}/build/cmake/android.toolchain.cmake \
 		-DANDROID_STL=c++_static \
 		-DANDROID_PLATFORM=android-14 \
-		-DANDROID_TOOLCHAIN=gcc \
+		-DANDROID_TOOLCHAIN=clang \
 		-DANDROID_ABI=armeabi \
 		-DLIBRARY_OUTPUT_PATH=../libs/armeabi/ -Hjni
 	${MAKE} -C build-android rime_jni