internal/rosa: populate runtime dependencies

This also removes manually resolved indirect dependencies.

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

internal/rosa/xcb.go

@@ -41,7 +41,6 @@ func (t Toolchain) newXCB() (pkg.Artifact, string) {
 		PkgConfig,
 
 		XCBProto,
-		Xproto,
 		LibXau,
 	), version
 }
@@ -53,6 +52,11 @@ func init() {
 		Description: "The X protocol C-language Binding",
 		Website:     "https://xcb.freedesktop.org/",
 
+		Dependencies: P{
+			XCBProto,
+			LibXau,
+		},
+
 		ID: 1767,
 	}
 }