graphics/egl-wayland: Update to 1.1.21
Updating to 1.1.21 with addition of missing LIB_DEPENDS,
which is a LIB_DEPENDS of only consumer of this port
(x11/nvidia-driver*).
Because of the above, this didn't cause any actual issues unless
installing this port alone with some reason.
https://github.com/NVIDIA/egl-wayland/releases/tag/1.1.21
PR: 288715, 290128
Approved by: ashafer (version bump)
Differential Revision: https://reviews.freebsd.org/D55397