internal/rosa/python: pass build dependencies separately

This is cleaner with less duplicate code.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/python.go

@@ -169,22 +169,23 @@ pip3 install \
 func newPythonPackage(
 	name string, id int, description, website, version string,
 	source pkg.Artifact, attrP *PackageAttr, attr *PipHelper,
-	dependencies P, extra ...PArtifact,
+	build P, extra ...PArtifact,
 ) Metadata {
 	name = "python-" + name
-	if dependencies == nil {
-		dependencies = slices.Concat(P{Python}, extra)
-	}
 	return Metadata{
 		f: func(t Toolchain) (pkg.Artifact, string) {
-			return t.NewPackage(name, version, source, attrP, attr, extra...), version
+			return t.NewPackage(name, version, source, attrP, attr, slices.Concat(
+				P{Python},
+				extra,
+				build,
+			)...), version
 		},
 
 		Name:        name,
 		Description: description,
 		Website:     website,
 
-		Dependencies: dependencies,
+		Dependencies: slices.Concat(P{Python}, extra),
 
 		ID: id,
 	}
@@ -285,8 +286,7 @@ func init() {
 		version, newFromGitHub(
 			"cpburnz/python-pathspec",
 			"v"+version, checksum,
-		), nil, nil, nil,
-		PythonFlitCore,
+		), nil, nil, P{PythonFlitCore},
 	)
 }