Only put *.vala files into VALASOURCES.
Only put *.vala files into VALASOURCES.

Otherwise the GENERATEDSOURCES are computed wrongly.

* tests/unit_tests/Makefile.fragment (tests_unit_tests_intset_VAPISOURCES):
New, for the .vapi files of tests_unit_tests_intset_VALASOURCES.
(tests_unit_tests_stringset_VAPISOURCES): Likewise.

rburchell/ck,rburchell/ck,rburchell/ck,rburchell/ck,rburchell/ck