Add partial support signal.h functioanlity. Pull in machine/signal.h

to define sig_atomic_t.

Sponsored by: Netflix

stand/libsa/Makefile

@@ -111,7 +111,7 @@ beforedepend:
 	for i in _time.h _strings.h _string.h; do \
 		[ -f xlocale/$$i ] || cp /dev/null xlocale/$$i; \
 	done; \
-	for i in ctype.h fcntl.h stdio.h stdlib.h; do \
+	for i in ctype.h fcntl.h signal.h stdio.h stdlib.h; do \
 		ln -sf ${SASRC}/stand.h $$i; \
 	done
 

stand/libsa/stand.h

@@ -88,6 +88,9 @@
 #define	EOFFSET	(ELAST+8)	/* relative seek not supported */
 #define	ESALAST	(ELAST+8)	/* */
 
+/* Partial signal emulation for sig_atomic_t */
+#include <machine/signal.h>
+
 struct open_file;
 
 /*