Fix some bad prototypes and formatting after conversion from K&R declaration.

Fix some bad prototypes and formatting after conversion from K&R declaration.

* lwlib/lwlib-Xaw.c: Include <ctype.h> for isdigit.
(fill_xft_data, set_text): Remove unused variable screen.
(draw_text): Cast bp to FcChar8*.
(find_xft_data): Return 0 if inst or xft_data is not set.
(wm_delete_window): Correct prototype.  Initialize widget to 0
and return if widget is still 0 after loop.

* lwlib/xlwmenu.c (XlwMenuSetValues, XlwMenuInitialize): Correct prototype.
(display_menu_item): Remove unused variable gi.
(make_windows_if_needed): Remove unused variable screen.
(XlwMenuRedisplay): Remove unused variable i.

* src/gtkutil.c (xg_get_pixbuf_from_pix_and_mask)
(xg_get_image_for_pixmap, create_dialog)
(xg_get_file_with_selection, xg_get_file_name, update_cl_data)
(menuitem_highlight_callback, make_menu_item)
(xg_create_one_menuitem, create_menus, xg_update_menu_item)
(xg_create_scroll_bar, xg_update_scrollbar_pos)
(xg_set_toolkit_scroll_bar_thumb, xg_tool_bar_button_cb)
(xg_tool_bar_proxy_help_callback, xg_tool_bar_detach_callback)
(xg_tool_bar_attach_callback, xg_tool_bar_help_callback)
(xg_tool_bar_item_expose_callback): Reformat prototype.
(xg_update_menubar): GList *group => GSList *group.
(xg_modify_menubar_widgets): Initialize witem to 0, check witem != 0
before use.
(update_frame_tool_bar): 4:th param to xg_get_image_for_pixmap changed
to GTK_IMAGE (wimage).

* src/xsettings.c (something_changedCB, parse_settings)
(apply_xft_settings): Reformat prototype.
(something_changedCB, init_gconf): Remove unused variable i.
(read_settings): Remove unused variable long_len.

* src/xsmfns.c (SSDATA): New macro.
(smc_save_yourself_CB, x_session_initialize): Use SSDATA for strings
passed to strlen/strcpy/strcat.
(create_client_leader_window): Surround with #ifndef USE_GTK.  Cast
7:th arg to XChangeProperty to (unsigned char *)