Create fewer empty version variants

Don't create empty version variants for binaries, objects, rust
rlibs or rust dylibs.

Test: no change to build.ninja
Change-Id: I62d4d43da476eafdb258a08b5ada758bb2971a1a
diff --git a/cc/library_sdk_member.go b/cc/library_sdk_member.go
index 41ce294..765fe71 100644
--- a/cc/library_sdk_member.go
+++ b/cc/library_sdk_member.go
@@ -85,8 +85,11 @@
 			variations := target.Variations()
 			if mctx.Device() {
 				variations = append(variations,
-					blueprint.Variation{Mutator: "image", Variation: android.CoreVariation},
-					blueprint.Variation{Mutator: "version", Variation: version})
+					blueprint.Variation{Mutator: "image", Variation: android.CoreVariation})
+				if mt.linkTypes != nil {
+					variations = append(variations,
+						blueprint.Variation{Mutator: "version", Variation: version})
+				}
 			}
 			if mt.linkTypes == nil {
 				mctx.AddFarVariationDependencies(variations, dependencyTag, name)