Make some dynamic X11 symbols option. _XData32 and _XRead32 are only available on 64-bit systems, and are chosen with macros in the X11 headers. So on 32-bit systems, it should fail to find these symbols and keep going anyhow.

/* This is needed for automake, so that it can build an empty archive */

int pointless_symbol_so_the_archive_doesnt_look_empty;