expat/tests/basic_tests.c is not present in recipe version, will add these changes to runtests.c and will send V2.
 
- Yes, expat/tests/basic_tests.c seperated out from runtests.c from version 2.6.0. 
- Afaik, the patch will apply directly to runtests.c as not major change except seperation was done in expat.

Thank-you for your work :) and sending V2 :) 

BR,
Siddharth