[Buildroot] [PATCH/next 2/2] replace MESA_EGL_NO_X11_HEADERS hack with upstream EGL_NO_X11

[Yann E. MORIN <yann.morin.1998@free.fr>]

Bernd, All,

On 2020-02-23 09:52 +0100, Bernd Kuhls spake thusly:
> Am Sun, 23 Feb 2020 09:41:20 +0100 schrieb Yann E. MORIN:
> > On 2020-02-20 19:59 +0100, Bernd Kuhls spake thusly:
> >> Mesa3d 20.0.0 deprecated MESA_EGL_NO_X11_HEADERS:
> >> https://cgit.freedesktop.org/mesa/mesa/commit/?
> id=6202a13b71e18dc31ba7e2f4ea915b67eacc1ddb
> > I think this change should be folded in the previous commit: indeed,
> > that's the bump of mesa3d that causes the trouble.
> even with mesa being bumped to 20.x old code still builds,

Before, the code built without warnings, now it builds with warnings.

> mesa3d 20.0.0
> just added a warning about the old define being deprecated. Splitting 
> both topics, version bump and EGL_NO_X11, still creates a bisectable 
> history and makes it easier to pinpoint problems to either one of these 
> topics so I would still vote for two patches.

Since that's us, Buildroot, adding the define in the first place, it's
our fault that the warnings appear.

So, the bump introduces a regression, that is a build without warnigns
now has warnings, and so the bump should come with the fix.

Regards,
Yann E. MORIN.

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