internal/rosa: key-value type

This type is used very frequently. The new type is much easier to type and can receive helper methods eventually if needed.

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

internal/rosa/gtk.go

@@ -35,7 +35,7 @@ func (t Toolchain) newGLib() (pkg.Artifact, string) {
 			)),
 		},
 	}, &MesonHelper{
-		Setup: [][2]string{
+		Setup: []KV{
 			{"Ddefault_library", "both"},
 		},
 	},