Log Message:
Change the PLIST_SUBST called "NOT_SUNOS" into two different
definitions for libsane-pint and libsane-sm3600. Because
under Linux, libsane-pint is also not installed (like on Solaris)
but libsane-sm3600 is installed (like NetBSD).

Also add PLIST.Linux to add libsane-qcam, libsane-v4l la files and
config files. (The man pages were already installed.)

Sorry, I did not test on Solaris, but did test on NetBSD 1.6.2_STABLE
and Linux.

TODO: make this package honor PKG_SYSCONFDIR instead of
hard-coded ${PREFIX}/etc and use CONF_FILES too.