meson: Enforce build order using generated headers directly
Both libtracker-fts and libtracker-data end up requiring includes from tracker-sparql.h, but we have to generate tracker-generated.h first. To solve this, commit a452173e introduced a dependency to an intermediate target (tracker_sparql_intermediate_dep). Use directly the custom target tracker_sparql_generated_header to enforce build order.
Closes: #78 (closed)