[PECOFF] Ignore /errorReport command line option.

/errorReport is a command line option to let the linker to report internal
linker error information to Microsoft. For LLD that option doesn't make any
sense, so it just ignores the option.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@191044 91177308-0d34-0410-b5e6-96231b3b80d8