internal/rosa/make: optionally format value as is

This enables correct formatting for awkward configure scripts.

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

internal/rosa/make.go

@@ -171,7 +171,10 @@ func (attr *MakeHelper) script(name string) string {
 							s = "-" + s
 						}
 						if v[1] != "" {
-							s += "=" + v[1]
+							if v[0] != "" {
+								s += "="
+							}
+							s += v[1]
 						}
 						if !yield(s) {
 							return