/usr/headers/GL/glx.h moved to libglvnd (#2951)

pacman -Fys glx.h
..
extra/libglvnd 1.2.0-5
    usr/include/GL/glx.h

development/compiling/compiling_for_x11.rst

@@ -35,7 +35,8 @@ Distro-specific oneliners
 +------------------+-----------------------------------------------------------------------------------------------------------+
 | **Arch Linux**   | ::                                                                                                        |
 |                  |                                                                                                           |
-|                  |     pacman -S scons pkgconf gcc libxcursor libxinerama libxi libxrandr mesa glu alsa-lib pulseaudio yasm  |
+|                  |     pacman -S scons pkgconf gcc libxcursor libxinerama libxi libxrandr mesa glu libglvnd alsa-lib \       |
+|                  |         pulseaudio yasm                                                                                   |
 +------------------+-----------------------------------------------------------------------------------------------------------+
 | **Debian** /     | ::                                                                                                        |
 | **Ubuntu**       |                                                                                                           |