[llvm-objdump][MachO] Fix test to work on Windows

This fails in http://lab.llvm.org:8011/builders/clang-x64-windows-msvc/builds/3208/steps/stage%201%20check/logs/stdio.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350871 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/tools/llvm-objdump/invalid-input.test b/test/tools/llvm-objdump/invalid-input.test
index 89ac352..83b1dc9 100644
--- a/test/tools/llvm-objdump/invalid-input.test
+++ b/test/tools/llvm-objdump/invalid-input.test
@@ -6,7 +6,7 @@
 UNKNOWN_FILE_TYPE: '{{.*}}invalid-input.test': The file was not recognized as a valid object file
 
 RUN: not llvm-objdump -macho -disassemble -g -dsym=%s %p/Inputs/bind.macho-x86_64 2>&1 | FileCheck %s -check-prefix=UNKNOWN_FILE_TYPE_DSYM
-UNKNOWN_FILE_TYPE_DSYM: {{.*}}llvm-objdump: error:
+UNKNOWN_FILE_TYPE_DSYM: error:
 
 RUN: not llvm-objdump -macho -disassemble -g -dsym=%p/missing-dsym %p/Inputs/bind.macho-x86_64 2>&1 | FileCheck %s -check-prefix=NO_SUCH_FILE_DSYM
 NO_SUCH_FILE_DSYM: error: '{{.*}}missing-dsym':