[llvm-lipo] Fix test on Windows

Error message outputs with lowercase on Windows.
Made test work on Widnows.

For example:
llvm-lipo: error: 'i386': no such file or directory

llvm-svn: 367266

llvm/test/tools/llvm-lipo/replace-invalid-input.test

@@ -12,7 +12,7 @@
 # INPUT_ARGS: error: replace expects a single input file
 
 # RUN: not llvm-lipo %t-universal.o -replace %t-32.o i386 -o %t.o 2>&1 | FileCheck --check-prefix=INVALID_FILE %s
-# INVALID_FILE: error: 'i386': No such file or directory
+# INVALID_FILE: error: 'i386': {{[nN]}}o such file or directory
 
 # RUN: not llvm-lipo %t-universal.o -replace i3866 %t-32.o -o %t.o 2>&1 | FileCheck --check-prefix=INVALID_ARCH %s
 # INVALID_ARCH: error: Invalid architecture: i3866