Fix svn_path_is_absolute to support H: or H:/ paths on Cygwin too.
Fix svn_path_is_absolute to support H: or H:/ paths on Cygwin too.

* subversion/libsvn_subr/path.c
  (svn_path_is_absolute): check for H: and H:/ paths both on Windows 
   and Cygwin.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion