ports: Update email address for multiple ports
Update maintainer email address to laurent@FreeBSD.org for:
deskutils/cairo-dock
deskutils/cairo-dock-plugins
devel/distcc
devel/z80-asm
emulators/hatari
math/openlibm
misc/img2xterm
net/mpich
net/py-mpi4py
sysutils/modules
Reviewed by: michaelo, thierry (mentor)
Approved by: michaelo, thierry (mentor)
Differential Revision: https://reviews.freebsd.org/D56284