[!POSIXSIGNALS]: Thoroughly obsolete, remove. This also gets rid of

an odd case where signals were not catched when debugging.

(main, empth_start): Using sa_handler with SA_SIGINFO is wrong.
Simply don't set SA_SIGINFO; the additional signal information is not
used anyway.

include/misc.h

@@ -90,18 +90,10 @@ struct mob_acc_globals {
 
 typedef u_char natid;		/* NSC_NATID must match this */
 
-#if defined(__linux__ ) || defined(__osf__)
-#define POSIXSIGNALS 1
-#endif
-
 #if !defined (_EMPTH_LWP) && !defined (_EMPTH_POSIX)
 #define _EMPTH_LWP     1
 #endif
 
-#if defined(_EMPTH_POSIX) && !defined(POSIXSIGNALS)
-#define POSIXSIGNALS
-#endif
-
 
 #if !defined(aix) && !defined(sgi)
 #ifndef ultrix			/* already defined in ultrix */