build: package: queue subpkg depends for base package too (MR 2380)

We handle this correctly for dependencies of the base package but not
the base package itself.... Fix this.

Should avoid duplication here ideally.

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>

pmb/build/_package.py

@@ -264,6 +264,12 @@ def process_package(
     if base_build_status.necessary():
         queue_build(base_aports, base_apkbuild, base_depends)
 
+    # Also traverse subpackage depends, they shouldn't be included in base_depends since they
+    # aren't needed for building (and can conflict with depends for other subpackages)
+    depends += sum(
+        map(lambda sp: sp["depends"] if sp else [], base_apkbuild["subpackages"].values()), []
+    )
+
     parent = pkgname
     while len(depends):
         # FIXME: pop(0) is really quite slow!