Add __aeabi_ulcmp implementation

This used to be provided by gcc, but not anymore. Some blobs from
previous Android versions (up to 4.0) still require it...

Change-Id: I52f5dae33ab8927f61abb1348147fbff8eeab938
Merge branch 'jellybean' of git://github.com/CyanogenMod/android_bionic into jellybean