Disable dw2-dir-file-name.exp on remote and/or Windows host.
    
    This test has many hardwired assumptions that pathnames on build and
    host are the same, and that POSIX pathname syntax is used.  This
    results in dozens of failures on a remote Windows host.  Fixing these
    assumptions would involve nontrivial rewrites; meanwhile, let's make
    the test results reflect the reality that this testcase isn't supported
    on remote host.
    
    2019-08-15  Sandra Loosemore  <sandra@codesourcery.com>
    
    	gdb/testsuite/
    	* gdb.dwarf2/dw2-dir-file-name.exp: Skip on remote or
    	Windows host.