Add new test drivers to Win32 build.
Add new test drivers to Win32 build.

* subversion.dsw (__check__): Add dependency on tests_libsvn_fs_key,
  tests_libsvn_fs_strings_reps, tests_libsvn_subr_subst and
  tests_libsvn_subr_path.
  (tests_libsvn_fs_key, tests_libsvn_fs_strings_reps, tests_libsvn_subr_subst,
   tests_libsvn_subr_path): Insert projects into workspace.
(tests_libsvn_subr_target): Add dependency on libsvn_subr.

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