swift234

[CMake] Android NDK r12 appends ".x" to libgcc dir

The Android NDK r12 release appends a ".x" to the libgcc directory;
it is now:

```
android-ndk-r12/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/lib/gcc/arm-linux-androideabi/4.9.x
```

Update the linker path for the Android build to accomodate this change.