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This solves the problem where read_key_sequence initializes and uses a global
buffer raw_keybuf, yet is called recusrsively.  The initialization is now done
elsewhere, avoiding the reinitialization of that global buffer.

* src/keyboard.c (command_loop_1, read_key_sequence_vs): Initialize
raw_event_count before calling read_key_sequence.
(read_char_x_menu_prompt): Call x_popup_menu_1 in place of Fx_popup_menu.
(init_raw_keybuf_count): New function.
(read_key_sequence): Remove initialization of raw_event_count.  Add a missing
GROW_RAW_KEYBUF invocation.

* src/keyboard.h: (init_raw_keybuf_count): New declaration.

* src/menu.c: (x_popup_menu_1): New function with the functionality of the
former Fx_popup_menu.
(Fx_popup_menu): Replace with function which initializes raw_event_count then
calls x_popup_menu_1.

* src/menu.h: (x_popup_menu_1): New declaration.