lavfi/opencl: Avoid deprecation warnings when built with post-1.2 headers

The intended target is OpenCL 1.2, so disable warnings for APIs deprecated
after that.  This primarily applies to clCreateCommandQueue(), we can't use
the replacement clCreateCommandQueueWithProperties() because it was
introduced in OpenCL 2.0.

Also remove some unnecessary includes from overlay and program filters so
that the define is available at the right moment.

libavfilter/opencl.h

@@ -19,6 +19,12 @@
 #ifndef AVFILTER_OPENCL_H
 #define AVFILTER_OPENCL_H
 
+// The intended target is OpenCL 1.2, so disable warnings for APIs
+// deprecated after that.  This primarily applies to clCreateCommandQueue(),
+// we can't use the replacement clCreateCommandQueueWithProperties() because
+// it was introduced in OpenCL 2.0.
+#define CL_USE_DEPRECATED_OPENCL_1_2_APIS
+
 #include "libavutil/buffer.h"
 #include "libavutil/hwcontext.h"
 #include "libavutil/hwcontext_opencl.h"

libavfilter/vf_overlay_opencl.c

@@ -16,16 +16,10 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "libavutil/avassert.h"
-#include "libavutil/buffer.h"
-#include "libavutil/common.h"
-#include "libavutil/hwcontext.h"
-#include "libavutil/hwcontext_opencl.h"
 #include "libavutil/log.h"
-#include "libavutil/mathematics.h"
 #include "libavutil/mem.h"
-#include "libavutil/pixdesc.h"
 #include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
 
 #include "avfilter.h"
 #include "framesync.h"

libavfilter/vf_program_opencl.c

@@ -17,14 +17,10 @@
  */
 
 #include "libavutil/avstring.h"
-#include "libavutil/buffer.h"
-#include "libavutil/common.h"
-#include "libavutil/hwcontext.h"
-#include "libavutil/hwcontext_opencl.h"
 #include "libavutil/log.h"
 #include "libavutil/mem.h"
-#include "libavutil/pixdesc.h"
 #include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
 
 #include "avfilter.h"
 #include "framesync.h"