internal/rosa: populate runtime dependencies

This also removes manually resolved indirect dependencies.

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

internal/rosa/libxslt.go

@@ -23,7 +23,6 @@ func (t Toolchain) newLibxslt() (pkg.Artifact, string) {
 		SkipCheck: true,
 	},
 		XZ,
-		Zlib,
 		Python,
 		PkgConfig,
 
@@ -38,6 +37,10 @@ func init() {
 		Description: "an XSLT processor based on libxml2",
 		Website:     "https://gitlab.gnome.org/GNOME/libxslt/",
 
+		Dependencies: P{
+			Libxml2,
+		},
+
 		ID: 13301,
 	}
 }