New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/31619#issuecomment-866308109

Comment:
```
[162/207] Compiling C object src/gnome-photos.p/photos-query-builder.c.o
../src/photos-query-builder.c: In function 'photos_query_builder_query':
../src/photos-query-builder.c:153:21: warning: implicit declaration of function 'photos_base_manager_get_sparql_template'; did you mean 'photos_base_manager_get_all_filter'? [-Wimplicit-function-declaration]
  153 |   sparql_template = photos_base_manager_get_sparql_template (state->srch_typ_mngr, flags);
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                     photos_base_manager_get_all_filter
../src/photos-query-builder.c:153:21: warning: nested extern declaration of 'photos_base_manager_get_sparql_template' [-Wnested-externs]
../src/photos-query-builder.c:153:19: warning: assignment to 'PhotosSparqlTemplate *' {aka 'struct _PhotosSparqlTemplate *'} from 'int' makes pointer from integer without a cast [-Wint-conversion]
  153 |   sparql_template = photos_base_manager_get_sparql_template (state->srch_typ_mngr, flags);
      |                   ^
../src/photos-query-builder.c: In function 'photos_query_builder_count_query':
../src/photos-query-builder.c:284:19: warning: assignment to 'PhotosSparqlTemplate *' {aka 'struct _PhotosSparqlTemplate *'} from 'int' makes pointer from integer without a cast [-Wint-conversion]
  284 |   sparql_template = photos_base_manager_get_sparql_template (state->srch_typ_mngr, flags);
      |                   ^
```

Why warnings matter (I have a PR to make this specific warning an error as well).