tools/nolibc: add setpgrp()

setpgrp() is defined to be identical to setpgid(0, 0).

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>

tools/include/nolibc/sys.h

@@ -952,6 +952,16 @@ int setpgid(pid_t pid, pid_t pgid)
 	return __sysret(sys_setpgid(pid, pgid));
 }
 
+/*
+ * pid_t setpgrp(void)
+ */
+
+static __attribute__((unused))
+pid_t setpgrp(void)
+{
+	return setpgid(0, 0);
+}
+
 
 /*
  * pid_t setsid(void);