Define a KERN_PROC_GID option for kvm_getprocs().

Submitted by:	Cyrille Lefevre

sys/sys/sysctl.h

@@ -419,9 +419,10 @@ TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
 #define	KERN_PROC_PROC		8	/* only return procs */
 #define	KERN_PROC_SV_NAME	9	/* get syscall vector name */
 #define	KERN_PROC_RGID		10	/* by real group id */
+#define	KERN_PROC_GID		11	/* by effective group id */
 #define	KERN_PROC_INC_THREAD	0x10	/*
 					 * modifier for pid, pgrp, tty,
-					 * uid, ruid, and proc
+					 * uid, ruid, gid, rgid and proc
 					 */
 
 /*