meson: Add dep_glvnd to egl deps withn building with glvnd
Otherwise if libglvnd is installed in a side folder the headers wont be found.
Fixes: 035ec7a2 ("meson: Add support for EGL glvnd")
Otherwise if libglvnd is installed in a side folder the headers wont be found.
Fixes: 035ec7a2 ("meson: Add support for EGL glvnd")