Pacify gcc -Og -Wuninitialized
This addresses the -Og uninitialized variable warnings I ran into on Fedora 28, which uses 8.1.1 20180712 (Red Hat 8.1.1-5). It also changes some explicit initializations to UNINIT when the variable does not actually need to be initialized. * src/process.c (connect_network_socket): * src/sysdep.c (system_process_attributes): * src/xfns.c (x_real_pos_and_offsets): * src/xterm.c (get_current_wm_state) [USE_XCB]: Add UNINIT. * src/editfns.c (tzlookup): * src/fns.c (Fnconc): * src/font.c (font_parse_fcname): * src/frame.c (x_set_frame_parameters): Prefer UNINIT to explicit initialization.
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