Fix incorrect odex path handling

It's wrong to just concatenate the apk_path and .odex.
The bug prevents the prebuilt odex being used since Kitkat.

The patch is copied from the code of JellyBean.

Change-Id: I0ce8a877e3df8ae1ab9a0e3aeeef2d5253efc223
Merge "Fix incorrect odex path handling"
Merge remote-tracking branch 'aosp/master' into fml-master