Don't create version variations of sdk modules

They are never used, skip creating them.

Test: m checkbuild
Change-Id: I4c8cd544327ae79b781f704be5a9064efdbdf2af
diff --git a/rust/rust.go b/rust/rust.go
index 1fc3b0e..9b18c8c 100644
--- a/rust/rust.go
+++ b/rust/rust.go
@@ -1053,7 +1053,7 @@
 		blueprint.Variation{Mutator: "link", Variation: "static"}),
 		cc.StaticDepTag(), deps.StaticLibs...)
 
-	crtVariations := append(cc.GetCrtVariations(ctx, mod), commonDepVariations...)
+	crtVariations := cc.GetCrtVariations(ctx, mod)
 	if deps.CrtBegin != "" {
 		actx.AddVariationDependencies(crtVariations, cc.CrtBeginDepTag, deps.CrtBegin)
 	}