linux-user/signal.c: Remove unused fenab
Remove fenab as it is only written, never used. Add a FIXME comment about the discrepancy between our behaviour and that of the Linux kernel for this routine. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NRiku Voipio <riku.voipio@iki.fi>
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