build: package: skip prioritizing deps of pkg which are a subpkg of pkg

Some packages in aports have their own subpackages in their dependencies, for some reason. This causes our resolver to assume there is a cyclical dependency.

Adjust the resolver to safely ignore these dependencies, since they'll be built as a part of the package that depends on them.

For example, modemmanager depends on libmm-glib which is a subpackage of modemmanager. Currently to build modemmanager in pmaports it would be necessary to manually modify the APKBUILD after copying it from aports. This change avoids that.

Fix #2473 (comment 453424)

pmb/build/_package.py

@@ -276,6 +276,10 @@ def prioritise_build_queue(disarray: list[BuildQueueItem]) -> list[BuildQueueIte
                     raise NonBugError(f"{item['name']}: dependency not found: {dep}")
                 dep = dep_data.pkgname
 
+                # If the dependency is a subpackage we can safely ignore it
+                if dep in item["apkbuild"]["subpackages"]:
+                    continue
+
                 if dep in all_pkgnames:
                     unmet_deps.setdefault(item["name"], []).append(dep)
                     missing_deps = True