V4L/DVB (4198): Avoid newer usages of obsoleted experimental MPEGCOMP API

Put old MPEGCOMP API under #if __KERNEL__ and issue warnings when used.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/cx88/cx88-blackbird.c b/drivers/media/video/cx88/cx88-blackbird.c
index 9fa1ddb..6e945de 100644
--- a/drivers/media/video/cx88/cx88-blackbird.c
+++ b/drivers/media/video/cx88/cx88-blackbird.c
@@ -805,10 +805,14 @@
 	{
 		struct v4l2_mpeg_compression *f = arg;
 
+		printk(KERN_WARNING "VIDIOC_G_MPEGCOMP is obsolete. "
+				    "Replace with VIDIOC_G_EXT_CTRLS!");
 		memcpy(f,&default_mpeg_params,sizeof(*f));
 		return 0;
 	}
 	case VIDIOC_S_MPEGCOMP:
+		printk(KERN_WARNING "VIDIOC_S_MPEGCOMP is obsolete. "
+				    "Replace with VIDIOC_S_EXT_CTRLS!");
 		return 0;
 	case VIDIOC_G_EXT_CTRLS:
 	{