devel/libsoup: make samba a (not registered) runtime dep
This picks up an idea from PR 235207 again, where NTLM authentication
is optional. Previous commits made samba a build-dependency so
that the --enable-ntlm option would work. The meson build -- even
though the dep is entirely runtime -- would check for the presence
of ntlm_auth at build-time, to be able to pass in the path to
ntlm_auth to the build.
Re-jig this to not do the check, accept the option as-is, and
use a likely path to ntlm_auth instead (which is what the original
patch in 235207 did).
A circular dependency from samba41[23] -> libsoup and back
can be triggered by setting option SMB in libsoup and
(Only the first 15 lines of the commit message are shown above )