devel/simavr: bump PORTREVISION

Looks like my patch not only fixed build, but only runtime with clang, error without it:
$ simavr -m fffffffffffffffffffffff
avr_make_mcu_by_name: AVR 'fffffffffffffffffffffff' not known
simavr: AVR 'fffffffffffffffffffffff' not known

$ simavr -m ffffffffffffffffffffffff
[1] 6849 segmentation fault simavr -m ffffffffffffffffffffffff

PR: 246719
Submitted by: felix@palmen-it.de (maintainer)