wayland-egl: Define WL_EGL_PLATFORM in wayland-egl.h
wayland-egl: Define WL_EGL_PLATFORM in wayland-egl.h

This indicates that we're using the wayland egl platform and will make
eglplatform.h typedef the native types correctly.

giucam/weston,xorgy/weston,mchalupa/weston,sir-murray/weston,eyolfson/wayland,Fantu/compositor-spice,krezovic/weston,tulcod/wayland,sir-murray/wayland,Tarnyko/weston-xdg_surface_present,eyolfson/weston,abooij/wayland,giucam/weston,sir-murray/wayland,abooij/wayland,Gnurou/weston,eyolfson/wayland,sir-murray/wayland,abooij/wayland,bitfactor/wayland,krezovic/weston,mchalupa/wayland,kwm81/weston,mchalupa/wayland,sir-murray/weston,Gnurou/weston,xorgy/weston,mchalupa/weston,kwm81/weston,tulcod/wayland,bitfactor/wayland,udoprog/weston,Tarnyko/weston-xdg_surface_present,tulcod/wayland,bitfactor/wayland,eyolfson/wayland,Fantu/compositor-spice,jonnylamb/weston,jonnylamb/weston,udoprog/weston,mchalupa/wayland,Fantu/compositor-spice,eyolfson/weston