Add a patch to fix a bug which prevents etex(1) from working. Without
this patch, the following code fragment causes a segmentation fault.

\toksdef\whatevertoks = 266
\toksdef\extratoks = 267
\whatevertoks={junk}
\everypar{\extratoks=\whatevertoks}
\immediate\write16{t={\the\toks265}}
some paragraph\par
\bye

Approved by: linimon (mentor)