(x_scroll_bar_handle_click): Compile only if

(x_scroll_bar_handle_click): Compile only if
not USE_TOOLKIT_SCROLL_BARS.
(x_scroll_bar_set_handle, x_scroll_bar_note_movement): Ditto.
(x_produce_glyphs): Remove unused variable(s).
(x_alloc_nearest_color_for_widget, note_tool_bar_highlight,
x_set_toolkit_scroll_bar_thumb): Ditto.
(x_scroll_bar_create): Move local variable to the
conditionally compiled section of code where it is used.
(x_scroll_bar_create): Remove unused variable(s).
(x_scroll_bar_remove, XTread_socket): Ditto.
(XTread_socket) <ConfigureNotify>: Move variables used for
non-toolkit case into conditionally compiled section of code.