swift234

[test] Update libgcc path for Android NDK r12

As noted in 8d4bc744c524de7b2d95978cfe0d492717130456,
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 used for the Android test suite to accomodate
for this change.