internal/rosa: disable LTO in tests

This is too expensive and not feasible for development.

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

internal/rosa/rosa_test.go

@@ -28,6 +28,7 @@ var (
 )
 
 func TestMain(m *testing.M) {
+	rosa.DropCaches(rosa.OptLLVMNoLTO)
 	container.TryArgv0(nil)
 
 	code := m.Run()