Fix libtracker-sparql dependency ordering issue

We need to express this dependency, otherwise the C code might fail to build with this kind of error:

../src/libtracker-sparql/tracker-notifier.c:89:10: fatal error: tracker-generated-no-checks.h: No such file or directory

The tracker-generated-no-checks.h file is generated by Vala.

Hopefully fixes #96 (closed)