Remove some GCC library warnings

lib/ansi/abort.c

@@ -17,6 +17,7 @@ abort(void)
 {
 	if (_clean) _clean();		/* flush all output files */
 	raise(SIGABRT);
+	exit(-1);
 	/* NORETURN */
 }
 

lib/other/settimeofday.c

@@ -9,6 +9,9 @@ settimeofday.c
 
 int settimeofday(const struct timeval *tp, const void *tzp)
 {
+	/* Use intermediate variable because stime param is not const */
+	time_t sec = tp->tv_sec;
+	
 	/* Ignore time zones */
-	return stime(&tp->tv_sec);
+	return stime(&sec);
 }

lib/sysutil/profile.c

@@ -22,7 +22,7 @@
 PRIVATE char cpath[CPROF_CPATH_MAX_LEN];	/* current call path string */
 PRIVATE int cpath_len;				/* current call path len */
 PRIVATE struct cprof_tbl_s *cprof_slot;		/* slot of current function */
-PRIVATE struct stack_s {			/* stack entry */
+struct stack_s {			/* stack entry */
 		int cpath_len;			/* call path len */
 		struct cprof_tbl_s *slot;	/* table slot */
 		u64_t start_1;			/* count @ begin of procentry */