net/nmsg port cleanup

[truckman]

Summary

MASTER_SITE dl.farsightsecurity.com only allows https downloads.

	  Mirror the distfile on LOCAL as a http backup for clients that
	  can't use https. (Suggested by mat@)

Add MANPAGES option (default YES) because generating the man page
adds a significant number of build dependencies.

Add a comment explaining that the DOXYGEN=NO option gets ignored
if doxygen is installed.

Use option helpers (suggested by mat@).

Use PORTDOCS=* to avoid the need to change pkg-plist if doxygen
changes.

Use INSTALL_TARGET=install-strip instead of ${STRIP_CMD}
(suggested by marino@).

Simplify examples installation.

Test Plan

Test downloads from both MASTER_SITES.

Test all options.

Build on FreeBSD 8, 9, and 10, and both amd64 and i386.

[mat]

net/nmsg/Makefile

27–28

Is there a CONFIGURE_ARGS thing you could use, like --disable-docs or something ?

[truckman]

net/nmsg/Makefile

27–28

Nope. There's one for the man page (--without-xsltproc), but nothing for the doxygen stuff. It does look at $DOXYGEN from the environment, but if you set it to '', it falls back to scanning $PATH. I also tried setting it to /bin/false and it took that as the full pathname of the doxygen executable. Configure claimed that it would then use that to build the docs, but I suspect the build would blow up later.

I can try to figure out the autoconf stuff and submit a patch upstream.

In the meantime, disabling the option at least prevents poudriere from dragging in doxygen and all of its dependencies.

[truckman]

Closed by commit rP376726 (authored by @truckman).