FIXED: Using illegal term-reference in handling thread signals.  Can cause crashes; shows up as being totally unresponsive most of the time in Linux.
FIXED: Using illegal term-reference in handling thread signals.  Can cause
crashes; shows up as being totally unresponsive most of the time in Linux.

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