Revert "Fix v4l2 build failure on Debian/kfreebsd"

This reverts commit 7711eb75.
This makes no sense as control types are _not_ macros.
(cherry picked from commit 74ba8ca7)

modules/access/v4l2/v4l2.h

@@ -33,8 +33,11 @@
 # warning Please update Video4Linux2 headers!
 # define V4L2_CTRL_FLAG_VOLATILE 0x0080
 #endif
-#ifndef V4L2_CTRL_TYPE_BITMASK /* 3.1 */
-# define V4L2_CTRL_TYPE_BITMASK 8
+#ifdef __linux__
+# include <linux/version.h>
+# if LINUX_VERSION_CODE < KERNEL_VERSION(3,1,0)
+#  define V4L2_CTRL_TYPE_BITMASK 8
+# endif
 #endif
 #ifndef V4L2_CID_ILLUMINATORS_1 /* 2.6.37 */
 # define V4L2_CID_ILLUMINATORS_1 (V4L2_CID_BASE+38)