ENOENT check pattern

Author: arsenm

llvm/test/tools/llvm-rc/windres-preproc.test

@@ -19,8 +19,8 @@
 
 ;; Test error messages when unable to execute the preprocessor.
 
-; RUN: not llvm-windres --preprocessor intentionally-missing-executable %p/Inputs/empty.rc %t.res 2>&1 | FileCheck %s --check-prefix=CHECK4
-; CHECK4: llvm-rc: Preprocessing failed: posix_spawn failed: No such file or directory
+; RUN: not llvm-windres --preprocessor intentionally-missing-executable %p/Inputs/empty.rc %t.res 2>&1 | FileCheck -DMSG=%errc_ENOENT %s --check-prefix=CHECK4
+; CHECK4: llvm-rc: Preprocessing failed: posix_spawn failed: [[MSG]]
 
 ;; Test --preprocessor with an argument with spaces.