Minor fixups related to usage of the 'long' type.

Minor fixups related to usage of the 'long' type.

* gnutls.c (emacs_gnutls_handshake):
* xfaces.c (dump_realized_face):
Work even if 'long' is narrower than 'void *'.
* termcap.c (scan_file):
* xselect.c (x_decline_selection_request)
(x_reply_selection_request, x_get_window_property):
* xterm.c (x_set_frame_alpha):
Remove unnecessary 'L' suffixes of integer constants.
* xfns.c (hack_wm_protocols):
* xselect.c (x_fill_property_data):
* xterm.c (x_set_offset, x_set_window_size_1, x_make_frame_invisible):
Remove unnecessary casts to 'long'.
(set_machine_and_pid_properties): Don't assume pid_t fits in 32 bits.