lavfi/deinterlace_vaapi: fix can't show full option information.

use ffmpeg -h filter=deinterlace_vaapi can't get full help information,
the root cause is not setting the flags fileld in options.
Signed-off-by: Jun Zhao <jun.zhao@intel.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavfilter/vf_deinterlace_vaapi.c

@@ -615,22 +615,22 @@ static const AVOption deint_vaapi_options[] = {
       OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = VAProcDeinterlacingNone },
       VAProcDeinterlacingNone, VAProcDeinterlacingCount - 1, FLAGS, "mode" },
     { "default", "Use the highest-numbered (and therefore possibly most advanced) deinterlacing algorithm",
-      0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingNone }, .unit = "mode" },
+      0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingNone }, 0, 0, FLAGS, "mode" },
     { "bob", "Use the bob deinterlacing algorithm",
-      0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingBob }, .unit = "mode" },
+      0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingBob }, 0, 0, FLAGS, "mode" },
     { "weave", "Use the weave deinterlacing algorithm",
-      0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingWeave }, .unit = "mode" },
+      0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingWeave }, 0, 0, FLAGS,  "mode" },
     { "motion_adaptive", "Use the motion adaptive deinterlacing algorithm",
-      0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingMotionAdaptive }, .unit = "mode" },
+      0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingMotionAdaptive }, 0, 0, FLAGS, "mode" },
     { "motion_compensated", "Use the motion compensated deinterlacing algorithm",
-      0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingMotionCompensated }, .unit = "mode" },
+      0, AV_OPT_TYPE_CONST, { .i64 = VAProcDeinterlacingMotionCompensated }, 0, 0, FLAGS, "mode" },
 
     { "rate", "Generate output at frame rate or field rate",
       OFFSET(field_rate), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 2, FLAGS, "rate" },
     { "frame", "Output at frame rate (one frame of output for each field-pair)",
-      0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .unit = "rate" },
+      0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, FLAGS, "rate" },
     { "field", "Output at field rate (one frame of output for each field)",
-      0, AV_OPT_TYPE_CONST, { .i64 = 2 }, .unit = "rate" },
+      0, AV_OPT_TYPE_CONST, { .i64 = 2 }, 0, 0, FLAGS, "rate" },
 
     { "auto", "Only deinterlace fields, passing frames through unchanged",
       OFFSET(auto_enable), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },