wm4 a0b43a11e4 vo_gl3: make it work on OpenGL 2.1
Now vo_gl3 should work with standard OpenGL 2.1, as long as the
GL_ARB_texture_rg extension is available. Optional features, which
require features that are always in OpenGL 3.0, but are available
as extensions only in OpenGL 2.1, are automatically disabled.

The force-gl2 suboption, which was an unreliable hack to run vo_gl3
in an OpenGL 2.1 context, is removed.

Significant changes are done to the extension loader to make it easier
to identify optional OpenGL features.

Context creation is a bit changed to simplify the code and to handle
the fallback better if OpenGL 3 context creation fails, and creating
an OpenGL legacy context is attempted.

Based on the initial work by Rudolf Polzer <divverent@xonotic.org>,
which included making the shader GLSL 1.20 compatible, and more.
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Compiling with full features requires development files for several
external libraries. Below is a list of some important requirements. For
more information see the output of './configure --help' for a list of options,
or look at the list of enabled and disabled features printed after running
'./configure'. If you think you have support for some feature installed
but configure fails to detect it, the file config.log may contain information
about the reasons for the failure.

Libraries specific to particular video output methods
(you'll want at least one of VDPAU, GL or Xv):
 - libvdpau (for VDPAU output, best choice for NVIDIA cards)
 - libGL (OpenGL output)
 - libXv (XVideo output)
general:
 - libasound   (ALSA audio output)
 - various general X development libraries
 - libfreetype (for libass)
 - libfontconfig (for libass)
 - libass
 - FFmpeg libraries (libavutil libavcodec libavformat libswscale libpostproc)

Most of the above libraries are available in suitable versions on normal
Linux distributions. However FFmpeg is an exception (distro versions may be
too old to work at all or work well). For that reason you may want to use
the separately available build wrapper that first compiles FFmpeg libraries
and libass, and then compiles the player statically linked against those.
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