ENHANCED: Unix version: while doing GC, do not block all signals.
ENHANCED: Unix version: while doing GC, do not block all signals.

We now keep handling the signals below for the indicated reasons.

    sigdelset(&tmp, SIGSTOP);		Allow ^Z
    sigdelset(&tmp, SIGCONT);
    sigdelset(&tmp, SIGQUIT);		Allow abort using ^\
    sigdelset(&tmp, SIGSEGV);		Terminate on fatal errors
    sigdelset(&tmp, SIGBUS);

koryonik/swipl-devel,mndrix/swipl-devel,jn7163/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,jn7163/swipl-devel,mndrix/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,edechter/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,jn7163/swipl-devel,koryonik/swipl-devel,koryonik/swipl-devel,edechter/swipl-devel