mkpasswd is finally available packaged on Arch, so add it to allow
manually replacing a password in /etc/shadow, for when chroots or
pam don't work as wanted. Also supports advanced hash algos like
yescrypt that can't be set via the pam stack yet.
Because the source for mkpasswd is part of the whois package, it
is currently packaged as part of whois. But it might get it's own
package in the future, so add a check for /usr/bin/mkpasswd during
build time.
modesetting_drv.so is the library that links to libgbm.so. We not only want
that libgbm.so has all dependecies satisfied, but also the lib that needs
libgbm.so in the first place.
