Log Message:
MesaDemos: update to 8.4.0

- Add option to install new eglinfo binary, disabled by default as
  it requires mesa with EGL and native X11 might not have that.

8.4.0
New features and changes:
- glxinfo now supports OpenGL 4.6
- glxinfo prints more OpenGL limits (GL 3.0 up to GL 4.6)
- glxinfo gained support for GL_ATI_meminfo and GL_NVX_gpu_memory_info
- eglinfo binary is now installed by `make install`
- misc bugfixes

8.3.0
This new mesa-demos release fixes the build issue against mesa 10.6 (Bug 91643)
and picks up the latest glxinfo changes.
- misc changes
- misc bugfixes