New maintainer
- Fix build with clang [1]
- Respect CXXFLAGS during build
- Make RUN_DEPENDS path independent

PR:		196088 [1] (based on)
Submitted by:	Real Huang <realhuang21@gmail.com> [1]
Get rid of gnomehier
Get rid of gnomehier
Get rid of gnomehier
get rid of gnomehier
Get rid of gnomehier
Unbreak
Final removal of WITH_NEW_XORG

This knob was turned on for all version of FreeBSD in r369875
(2014-10-03) and officially deprecated. Since then, it was gradually
removed from many ports when they needed an update.

x11-servers/xorg-server was the last major user of this knob. The port
was updated to xserver 1.14 in r374982 (2014-12-19). The update got rid
of the knob, clearing the path to the final removal.

This commit changes ports who were checking for WITH_NEW_XORG and remove
its handling from bsd.port.mk.

While here, two sanity checks are added to warn user about WITH_KMS and
WITH_NEW_XORG which have no effect now.

Differential Revision:	https://reviews.freebsd.org/D1351
Reviewed by:	antoine, bapt, kwm
Approved by:	portmgr (antoine, bapt), kwm
Get rid of gnomehier
Get rid of gnomehier
Get rid of gnomehier