Log message:
Remove USE_PKGINSTALL from pkgsrc now that mk/install/pkginstall.mk
automatically detects whether we want the pkginstall machinery to be
used by the package Makefile.

Log message:
Fixed pkglint warnings. The warnings are mostly quoting issues, for
example MAKE_ENV+=FOO=${BAR} is changed to MAKE_ENV+=FOO=${BAR:Q}. Some
other changes are outlined in

    http://mail-index.netbsd.org/tech-pkg/2005/12/02/0034.html

Log message:
Replaced "# defined" with "yes" where appropriate.

Log message:
Use REQD_DIRS instead of MAKE_DIRS for directories under ${PREFIX} so
that these directories will be conditionally removed (based on reference
counts), regardless of the value of PKG_CONFIG.  Bump the PKGREVISION
for packages that were modified as a result.

Log message:
Fix print-PLIST generation (broken by incorrect regexp in MKDIR handling).

Log message:
During PLIST generation, suppress MKDIR lines that create directories
handled by these packages.  Found by wiz@.

Log message:
We don't need to use ${SORT} to sort a list -- just use the :O modifier.

Log message:
Remove USE_BUILDLINK3 and NO_BUILDLINK; these are no longer used.

Log message:
Now pick maintainership, to let people know who to bla^Wcomment to.

Log message:
Rework the way to use the -dirs packages (ATM, xdg-dirs, xdg-x11-dirs,
gnome1-dirs and gnome2-dirs):

- Introduce a global USE_DIRS variable, which takes pairs of names and
  versions.  For example, an xdg-1.1 value will request the use of the
  xdg-dirs package, at least version 1.1.  This variable must always be
  appended to.  If there are duplicates with different versions, the
  one with the higher number will be picked up.

- Introduce the mk/dirs.mk file, which is automatically included by
  bsd.pkg.mk when USE_DIRS is not empty.  It parses the variable's value
  and includes the required dirs.mk files, present in each -dirs package.

- For each -dirs package, add a dirs.mk file that defines a variable
  holding the list of directories provided by it, adds a dependency on
  that package, and modifies the PRINT_PLIST_AWK variable to output
  comments for the directories handled by it.

- Drop some Makefile.common files that only make things difficult and
  more confusing now (in favour of the new dirs.mk files).  The only thing
  to worry about is to keep version numbers consistent across xdg-* and
  gnome*-* packages, but that will be easier to handle.

The main reason for this change is to be able to modify PRINT_PLIST_AWK in
a clean way, but I hope this will improve clarity too.  Also, this simplifies
the addition of future -dirs packages (if needed) in a consistent way.