(toplevel) [USE_MOTIF]: Include some Motif headers.

(toplevel) [USE_MOTIF]: Include some Motif headers.
(struct x_resources) [USE_X_TOOLKIT]: New.
(xm_apply_resources, xm_set_menu_resources_from_menu_face)
[USE_MOTIF]: New.
(xl_apply_resources, xl_set_menu_resources_from_menu_face)
[USE_LUCID]: New.
(x_set_menu_resources_from_menu_face) [USE_X_TOOLKIT]: New.
(Qmenu): New.
(syms_of_xfaces): Initialize Qmenu.
(realize_basic_faces): Realize face `menu'.
(resolve_face_name): New.
(lface_from_face_name): Use it.
(Finternal_set_lisp_face_attribute): Ditto.
(Fpixmap_spec_p): Rewritten.  Extend doc string.