egl: bump extension string length

We've actually been over the 1000 char limit for a while, but we didn't
have a driver in CI that enabled enough extensions to notice it.

If all currently supported extensions are enabled, we need 1441 chars.
Let's bump the string to 2048 to have a little bit of margin.

Signed-off-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24781>
1 file changed