Rename graphics/libxatracker to graphics/mesa-gallium-xa

Mesa 20.2 update will split some of the gallium driver into their
own ports so rename this gallium driver to be named like the other ones.

Reviewed by:	zeising
X-Differential Revision:	https://reviews.freebsd.org/D26682

mesa-libs: Add glesv1 lib

There is no real reason to disable glesv1 so add it to the build.
While here add a USE_GL for it.

Reviewed by:	zeising
Approved by:	x11 (zeising@)
Differential Revision:	https://reviews.freebsd.org/D26461

graphics/libxatracker: Fix typo MESA vs MESON

Reported by:	tobik

graphics/mesa: Fix minor issues from meson switch

Fix a couple of minor issues with mesa related ports after the switch to
meson.
Define _GNU_SOURCE when building on FreeBSD.  This fixes blur effects in
Plasma 5 and issues with the SDDM greeter.  This fix was originally applied
in r516100 but got lost in the switch to meson. [1]
Properly detect sys/sysctl.h on FreeBSD.  On FreeBSD sys/sysctl.h needs
sys/types.h as well, patch the meson build script to take this into account.
Fix a broken sed command to properly set ${LOCALBASE}/etc and
${LOCALBASE}/share/ as appropriate.

Bump portrevision of all mesa related ports.

PR:		247138 [1]
Reported by:	Roman [1]
Reviewed by:	manu
Tested by:	Roman, Serge Volkov
Differential Revision:	https://reviews.freebsd.org/D25265

libxatracker: remove local dep on meson

The meson dependency in libxatracker is already included from
mesa-dri/Makefile.common, no need to add it to USES= here as well.

mesa*: Switch to meson

Upstream switched to meson for their build system so do the same as
it will be easier to find problems sooner than later.
This also switch to python3, python is only used for the build.
There is more thing enabled by default (or auto-enabled based on some
configuration) so we need to disable a lot more things than with autotools.

This should be a non functional change.

Reviewed by:	zeising (x11@)
Differential Revision:	https:/reviews.freebsd.org/D25092

graphics/mesa: Update to 19.0.8

Update mesa and related ports to 19.0.8.
This is the last version where the autotools build system is being used.
This serves as a stepping stone for reworking the ports to use the meson
build system and to enable further updates.

PR:		235570
Submitted by:	jbeich (with minor changes)
Differential Revision:	https://reviews.freebsd.org/D19099
			https://reviews.freebsd.org/D19100

- Update WWW

Approved by:	portmgr blanket

graphics/mesa: Add -D_GNU_SOURCE to compile flags

Add -D_GNU_SOURCE to compile flags when building on FreeBSD.  This is needed
to have mesa work with various locales, that for instance use , instead of .
as a decmal separator.

Bump portrevision on all mesa related ports.

PR:		241506
Reported by:	Jesper Schmitz Mouridsen
MFH:		2019Q4

Bump remaining mesa ports after llvm version change

Bump these mesa ports as well, to ensure that they are rebuilt with the
correct llvm port.
This was missed in r513776

PR:		239682
MFH:		2019Q4 (implicit, fix for earlier commits)

New port: graphics/libxatracker

XA Tracker is built from Mesa sources and is required by xf86-video-vmware
in order to take advantage of accelerated graphics using the vmwgfx kernel
DRM driver.

This commit also adds libdrm as a runtime requirement for xf86-video-vmware
and patches the DRI device loading routine to work outside of Linux. If no
DRI device exists (vmwgfx kernel driver is not loaded), xf86-video-vmware
will fallback to software rendering.

The vmwgfx kernel driver is available in the drm-kmod port.

Reviewed by:	zeising
Approved by:	imp (mentor), zeising
Differential Revision:	D20153