Add support for "distributed" patches and a little extra cleanup.

New variables:

PATCH_SITES:	patch equivalent of MASTER_SITES, overridable with
.		MASTER_SITE_OVERRIDE.
PATCHFILES:	Additional files to fetch and give to patch before
.		applying the ones in patches/patch-*.  If name ends
.		with ".gz" or ".Z", it will be piped through zcat first.

Plus PATCH_DIST_STRIP and PATCH_DIST_ARGS that serve the same functions
as PATCH_STRIP and PATCH_ARGS for patches in patches/patch-*.

In the documentation and echo messages, I used the term "distributed
patches" and "FreeBSD patches" to refer to ${PATCHFILES} and patches/patch-*.
If you can come up with better names, by all means go ahead and fix them.

"grep PATCH /usr/ports/*/*/Makefile" reveals seven ports (mule, jless,
jtcl, jtk, dgd, less, color_xterm, gee I wonder why I'm the one who
implemented this) that can benefit from this.  I'm now diving headlong
into /usr/ports to fix their Makefiles.

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