Revision 1498169

On the fsfs-format7 branch: fix a linker issue with the new fsx backend.
Give all non-static function a 'svn_fs_x__' prefix.  Update callers

* subversion/libsvn_fs_x/revprops.h
  (write_revprop_generation_file,
   cleanup_revprop_namespace,
   upgrade_pack_revprops,
   upgrade_cleanup_pack_revprops,
   get_revision_proplist,
   set_revision_proplist,
   packed_revprop_available,
   copy_revprops,
   pack_revprops_shard,
   delete_revprops_shard): rename these to ...
  (svn_fs_x__write_revprop_generation_file,
   svn_fs_x__cleanup_revprop_namespace,
   svn_fs_x__upgrade_pack_revprops,
   svn_fs_x__upgrade_cleanup_pack_revprops,
   svn_fs_x__get_revision_proplist,
   svn_fs_x__set_revision_proplist,
   svn_fs_x__packed_revprop_available,
   svn_fs_x__copy_revprops,
   svn_fs_x__pack_revprops_shard,
   svn_fs_x__delete_revprops_shard): ... these

* subversion/libsvn_fs_x/revprops.c
  (): same renames as above
  (svn_fs_x__upgrade_pack_revprops,
   svn_fs_x__upgrade_cleanup_pack_revprops,
   end_revprop_change,
   svn_fs_x__pack_revprops_shard): update callers

* subversion/libsvn_fs_x/fs_x.c
  (upgrade_body,
   svn_fs_x__revision_proplist,
   write_revision_zero,
   change_rev_prop_body): ditto

* subversion/libsvn_fs_x/hotcopy.c
  (hotcopy_body): same here

* subversion/libsvn_fs_x/pack.c
  (pack_shard): and here

* subversion/libsvn_fs_x/recovery.c
  (recover_body): and here