Add engv32.h to SIM_EXTRA_DEPS in sim/cris

A rebuild showed that an earlier change of mine missed a built header
file -- cris/engv32.h.  This patch fixes the problem.

sim/cris/ChangeLog
2021-04-25  Tom Tromey  <tom@tromey.com>

	* Makefile.in (SIM_EXTRA_DEPS): Add engv32.h.