libv4l: Fix musl compatibility, update to 1.6.3

Signed-off-by: Ted Hess <thess@kitschensync.net>

libs/libv4l/patches/020-add-missing-includes.patch

@@ -8,3 +8,21 @@
  #include <fcntl.h>
  #include <errno.h>
  #include <sys/ioctl.h>
+@@ -36,6 +37,7 @@
+ #include <dirent.h>
+ #include <config.h>
+ #include <signal.h>
++#include <time.h>
+ 
+ #include <linux/videodev2.h>
+ #include <libv4l2.h>
+--- a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
++++ b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
+@@ -14,6 +14,7 @@
+ #include <sys/mman.h>
+ #include <dirent.h>
+ #include <math.h>
++#include <time.h>
+ 
+ #include "v4l2-ctl.h"
+