test: specify touch time to ensure mod time difference

rdar://78027229

Author: nkcsgexi

test/ModuleInterface/build-alternative-interface.swift

@@ -22,7 +22,7 @@
 
 // RUN: %target-typecheck-verify-swift -disable-implicit-concurrency-module-import -I %t/inputs -backup-module-interface-path %t/alternative-inputs -module-cache-path %t/module-cache
 
-// RUN: touch %t/inputs/Bar.swiftinterface
+// RUN: touch -t 201401240005 %t/inputs/Bar.swiftinterface
 // RUN: %target-swift-frontend-typecheck -disable-implicit-concurrency-module-import -I %t/inputs -backup-module-interface-path %t/alternative-inputs -module-cache-path %t/module-cache -Rmodule-interface-rebuild %s &> %t/remarks.txt
 // RUN: %FileCheck --input-file %t/remarks.txt %s --check-prefix=CHECK-REBUILD
 // CHECK-REBUILD: remark: rebuilding module 'FooBar' from interface