Replace use of strcpy() in libsvn_fs_fs, my compiler keeps complaining.
Replace use of strcpy() in libsvn_fs_fs, my compiler keeps complaining.

* subversion/libsvn_fs_fs/fs_fs.c
  (get_shared_txn): Use strncpy() instead of strcpy(). Make sure to
   NUL-terminate the string in all cases.
  (recover_find_max_ids): As above, and also add assertions of the
   source string length similar to the assertion in get_shared_txn(),
   so we can, at least in debug mode, detect truncation.

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