Retire misc/ldconfig_compat. Thee served us well

PR:             ports/146532
Submitted by:   Alex Kozlov <spam@rm-rf.kiev.ua>

Begin the process of deprecating sysutils/rc_subr by
s#. %%RC_SUBR%%#. /etc/rc.subr#

- Remove unneeded dependency from gtk12/gtk20 [1]
- Remove USE_XLIB/USE_X_PREFIX/USE_XPM in favor of USE_XORG
- Remove X11BASE support in favor of LOCALBASE or PREFIX
- Use USE_LDCONFIG instead of INSTALLS_SHLIB
- Remove unneeded USE_GCC 3.4+

Thanks to all Helpers:
        Dmitry Marakasov, Chess Griffin, beech@, dinoex, rafan, gahr,
        ehaupt, nox, itetcu, flz, pav

PR:             116263
Tested on:      pointyhat
Approved by:    portmgr (pav)

Remove support for OSVERSION < 5

- Re-add LDCONFIG*_DIR to bsd.ldconfig.mk since it causes directories not
being created at install-time (LDCONFIG*_DIR defined in bsd.port.post.mk). [1]
- Update to a more recent version the ldconfig script.

Reported by:    fenner [1]

Zero the file until we remove all bsd.ldconfig.mk inclusion from ports
using early version of USE_LDCONFIG.

Fix plist issue on RELENG_4, libdata/ldconfig directories were only
in BSD.x11-4.dist. I just fixed that in BSD.local.dist.

- Fix problem with ancient make.

PR:             ports/93143
Submitted by:   Eric Cronin <ecronin@gizmolabs.org>

Back out last change while the bug it introduced is being investigated.

Noticed by:     lofi
Pointy hat to:  edwin

eplace ugly "@unexec rmdir %D... 2>/dev/null || true" with @dirrmtry

Approved by:    krion@
PR:             ports/88711 (related)

Guarantee of ${PREFIX}/${LDCONFIG{,32}_DIR} are created.

Approved by:    flz

- Remove hardcoded /etc/rc.subr.

Reported by:    Sean Winn <sean@gothic.net.au>

Ok, maybe I'll do something right today. Revert the logic.

- IGNORE for recent RELENG_[56].

Reminded by:    mnag

Been there, broke that.

Reported by:    portsnap buildbox

- ldconfig changes have been MFC'ed to RELENG_[56].

- Fix issue when WITHOUT_X11 is defined.

Noticed by:     mnag

- Adding sensible defaults to the startup script so people don't need to
touch /etc/rc.conf anymore.
- Silent @dirrm for ldconfig directories, this ensures a quiet upgrade.
- Fix installation with package, directories weren't created.

Noticed by:     pav

- Fix RUN_DEPENDS in bsd.ldconfig.mk.
- In a previous commit, I said that you need to use the install-rc-script,
you should read install-ldconfig-file.

Noticed by:     ale

- Add a note about variables used by the script in pkg-message.

Forced commit to note that you need to include this as well before
bsd.ldconfig.mk moves to bsd.port.mk:

--
.include <bsd.port.pre.mk>
.include "${PORTSDIR}/misc/ldconfig_compat/bsd.ldconfig.mk"
--

Add ldconfig_compat, a port that installs a ldconfig compatibility script
to reflect latest changes to /etc/rc.d/ldconfig which are the use of ldconfig
directories (${PREFIX}/libdata/ldconfig{,32}). This change is meant to remove
so-called ldconfig startup scripts installed by ports as 000.${foo}.sh.

The bsd.ldconfig.mmk file is only temporary as this should move quickly to
bsd.port.mk. Anyway, to use it, just define the following in your ports'
Makefile :

USE_LDCONFIG=   dir1 dir2

and (before bsd.ldconfig.mk moves to bsd.port.mk) :

post-install: install-rc-script