TZUTC: -0800
MSGID: 53931.syncprog@1:103/705 2dbf7d86
PID: Synchronet 3.21a-Linux master/48922a15c Dec 17 2025 GCC 12.2.0
TID: SBBSecho 3.34-Linux master/9d48b246c Jan 02 2026 GCC 12.2.0
BBSID: VERT
CHRS: UTF-8 4
FORMAT: flowed
https://gitlab.synchro.net/main/sbbs/-/commit/ab56f3e0a9cdab624e6f5315
Modified Files:
	src/conio/ciolib.c
Log Message:
Fix potential races around init and ungot chars

Since we now require pthreads for ciolib anyway (pthread_once_t in
ciolib.h), we can avoid races properly.

Make initialized atomic, and have a lock around updating it, and add
a lock around the ungot characters (heavily used by Windows GDI).

This possibly fixes bug ticket 214.
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