meson: bump required glvnd version
https://github.com/KhronosGroup/EGL-Registry/pull/95 has moved
a couple of extensions defines and functions to the upstream eglext.h
,
but when 9a74746b sync'ed these files we broke compilation
of apps that require these symbols on systems that don't have the
updated Khronos headers.
On non-GLVND builds, we still provide these headers, so everything's fine, but on GLVND builds the Khronos headers are external so we need to make sure we have a libglvnd version that's recent enough.
Fixes: 9a74746b ("EGL: sync headers with Khronos")