Swap the libc.so with the correctly-patched version

The file is downloaded from a CI build at [1]. See the readme at [2] to understand why this is needed.

[1] https://gitlab.com/ubports/android/aosp-phablet-4.4.2/build-phablet-libc-for-4.4-devices/-/jobs/839198798

[2] https://gitlab.com/ubports/android/aosp-phablet-4.4.2/build-phablet-libc-for-4.4-devices/-/blob/master/README.md