debian: Include the .dll file for mod_managed

Note that we don't actually support building mod_managed at this time
for Debian.

FS-5317 --resolve

Thanks-to: Artur Kraev <ravenox@gmail.com>
debian: Handle mod_managed .dll more idiomatically
debian: Add additional module files for mod_spidermonkey

Note that we don't actually support building mod_spidermonkey for
Debian at the moment.

FS-4552