- 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)