CMAKE: changed CMAKE_ANDROID_STL_TYPE - gnustl_static was removed

Author: mgerhardy

cmake/toolchains/android-toolchain.cmake

@@ -2,6 +2,6 @@ set(CMAKE_SYSTEM_NAME Android)
 set(CMAKE_SYSTEM_VERSION 21) # API level
 set(CMAKE_ANDROID_ARCH_ABI armeabi-v7a)
 set(CMAKE_ANDROID_NDK ${ANDROID_NDK})
-set(CMAKE_ANDROID_STL_TYPE gnustl_static)
+set(CMAKE_ANDROID_STL_TYPE c++_static)
 set(CMAKE_ANDROID_API_MIN 21)
 set(ANDROID True)