[llvm-rc] Don't strictly require quotes around external file names

Regardless of what docs may say, existing resource files in the
wild can use this syntax.

Rename a file used in an existing test, to make it usable for unquoted
paths.

Differential Revision: https://reviews.llvm.org/D46511

llvm-svn: 331747
GitOrigin-RevId: 4021cee996f75e8f591991e53180d1d29dfd20d6
8 files changed