crecord: avoid setting non-existing SIGTSTP signal on windows (issue5512) Windows do not have a SIGTSTP so we avoid setting the handler if the signal is unknown.

crecord: ensure we reinstall the SIGTSTP handler Previous, exceptions would prevent the reinstallation of the signal.

crecord: avoid setting non-existing signal SIGWINCH on windows Windows do not have a SIGWINCH so we avoid setting the handler if the signal is unknown.