[xzero] adds another UnixSignals impl, PosixSignals, that just uses signal() and is used on WSL as well as non-supported special platforms
[xzero] adds another UnixSignals impl, PosixSignals, that just uses signal() and is used on WSL as well as non-supported special platforms

xzero/x0,xzero/x0,christianparpart/x0,xzero/x0,christianparpart/x0,xzero/x0,xzero/x0,christianparpart/x0,xzero/x0,christianparpart/x0,christianparpart/x0,christianparpart/x0,christianparpart/x0