a new typedef for signal handlers - sig_func_t
(the old one is kept around for backwards compatibility)
a new macro MAX_SIGNO to get rid of magic 32's all about
two more functions (sigemptyset and sigfillset) are now
defined inline as well
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1975 a95241bf-73f2-0310-859d-f6bbb57e9c96