allow error handling to work with threads replace heap_base by Yap_heap_base, according to Yap's convention for globals. git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1192 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
allow error handling to work with threads replace heap_base by Yap_heap_base, according to Yap's convention for globals. git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1192 b08c6af1-5177-4d33-ba66-4b1c6b8b522a