- add mzdyn3m.o which gets built on s390x (possibly replacing mzdyn3m.lo)

This time I even have a successful build :-) (see openSUSE_Factory_zSystems)

As a side note: there is a very long time in the build without any output:

[ 13s] cc -O2 -DZUO_LIB_PATH='"'".././zuo/lib"'"' -o bin/zuo ./zuo/zuo.c
[ 9616s] bin/zuo . all MAKE="/usr/bin/make"

Depending on the load on the mainframe, this time can even be longer, and causes the build to abort because there's no output for a very long time.

From the openSUSE_Factory / s390x build log (which seems to have a shorter timeout of "only" 90 minutes):

[ 12s] cc -O2 -DZUO_LIB_PATH='"'".././zuo/lib"'"' -o bin/zuo ./zuo/zuo.c
[ 5417s] qemu-system-s390x: terminating on signal 15 from pid 99276 ()

If there is a way to make that cc call faster and/or more verbose, please do it ;-)