shared/platform: avoid build warning when building without gl-renderer
When building without GL renderer the compiler prints the following warning: ../clients/subsurfaces.c: In function ‘egl_state_create’: ../clients/subsurfaces.c:225:35: warning: passing argument 1 of ‘weston_platform_get_egl_display’ makes pointer from integer without a cast [-Wint-conversion] 225 | weston_platform_get_egl_display(EGL_PLATFORM_WAYLAND_KHR, | ^~~~~~~~~~~~~~~~~~~~~~~~ | | | int ...
Define the fallback implementation of weston_platform_get_egl_display to take an integer which is the underlaying datatype of EGLenum.
Signed-off-by: Stefan Agner stefan@agner.ch