[binutils-gdb] sim: sh: clean up gencode

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT ed4d32c28adc5f00ee9bc0e4ac785eeff5e1dc74 ***

Author: Mike Frysinger <vapier@gentoo.org>
Branch: master
Commit: ed4d32c28adc5f00ee9bc0e4ac785eeff5e1dc74

sim: sh: clean up gencode
The build line was missing the normal BUILD_xxx flags.  Once we added
that, we get warnings that weren't shown before.  As we fix those, we
notice that the -d option segfaults because it tries to write readonly
memory.  Fix that too as part of the const/prototype clean up.