Log message:
Simply and speed up buildlink3.mk files and processing.
This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.

Log message:
Add DESTDIR support.

Log message:
Recursive PKGREVISION bump for gnutls-2.2.2 update with shlib major bump.

Log message:
use GNU iconv on DragonFly, should fix the error seen in bulk build

Log message:
There is no obvious reason for USE_GNU_ICONV, and I haven't found one by
code inspection, so remove it.
approved by markd (a while ago)

Log message:
Fix paths for GConf, libglade, libart, libsigc++, lablgtk moves.
Bump PKGREVISION.

Log message:
Bump PKGREVISION for gnome-vfs rename.

Log message:
opencdk shlib major changed; bump ABI depends and PKGREVISIONs of
affected packages.

Log message:
Bump revisions due to gnome-vfs2 update: dbus-glib is now a dependency.
This fixes problems when some installed packages are outdated.
Per wiz@'s request.

Grrr, I really hate this kind of change.

Log message:
Change the format of BUILDLINK_ORDER to contain depth information as well,
and add a new helper target and script, "show-buildlink3", that outputs
a listing of the buildlink3.mk files included as well as the depth at
which they are included.

For example, "make show-buildlink3" in fonts/Xft2 displays:

	zlib
	fontconfig
	    iconv
	    zlib
	    freetype2
	    expat
	freetype2
	Xrender
	    renderproto