add for porting

src/libregexp/lib9.std.h

@@ -0,0 +1,10 @@
+#include <fmt.h>
+#include <setjmp.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define	exits(x)	exit(x && *x ? 1 : 0)
+
+#define	nil	0
+