graphics/blender: add missing dependencies for WAYLAND=on

$ make clean all WITH=WAYLAND
[...]
-- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)
-- wayland-client not found, disabling WITH_GHOST_WAYLAND
[...]
-- wayland-protocols not found, disabling WITH_GHOST_WAYLAND
[...]

$ env -u DISPLAY blender
GHOST: failed to initialize display for back-end(s): ['X11']
GHOST: unable to initialize, exiting!