Add new testcases for svn_path_is_child, check for support of 'H:' and UNC paths.
Add new testcases for svn_path_is_child, check for support of 'H:' and
UNC paths.

* subversion/tests/libsvn_subr/path-test.c
  (test_path_is_child): new test cases. Cleaned up a bit so now it's clear 
   again what's tested.
  (test_funcs): marked test_path_is_child XFail on Win32 and Cygwin.

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