The packages in the official Debian repos have slightly more
up-to-date metadata. This change adjusts our metadata.
This includes the change from Debian repo to let debhelper (>= 10.3)
handle the meson build of keyman-keyboardprocessor.
Makefile
make deb - build debs for kmflcomp, libkmfl, ibus-kmfl
make cow - set up pbuilder environment
make tmpbuild(default) - build and install to /tmp/kmfl
make install_local - build and install to /usr/local
make uninstall_local - uninstall ibus-kmfl config file
non-release version numbers will be stamped with date to
distinguish between builds
