updated for version 7.3.864
Problem:    Can't build without the mouse feature.
Solution:   Add an #ifdef. (Ike Devolder)
Added tag v7-3-864 for changeset a82ef37d38c0
updated for version 7.3.865
Problem:    Mouse position may be wrong.
Solution:   Let vungetc() restore the mouse position.
Added tag v7-3-865 for changeset 94342b0605fb