(Qhyper, Qsuper, Qmeta, Qalt, Qctrl, Qcontrol, Qshift): Remove unused

(Qhyper, Qsuper, Qmeta, Qalt, Qctrl, Qcontrol, Qshift): Remove unused
variables.
(syms_of_macfns): Don't initialize them.  Likewise for
Qface_set_after_frame_default.  Defvar and initialize
Vx_window_horizontal_drag_shape.
(x_set_mouse_color): Change mouse pointer shape.
(mac_window) [!MAC_OSX]: Create root control.
(mac_window): Remove initializations of mouse pointer shapes.
(hourglass_started): New function (from xfns.c).
(start_hourglass, cancel_hourglass): Put function body in #ifdef
MAC_OSX.
(show_hourglass) [TARGET_API_MAC_CARBON]: Create progress
indicator for each non-tooltip frame if needed, and show it.
(hide_hourglass) [TARGET_API_MAC_CARBON]: Hide progress indicators.