[FFmpeg-cvslog] avfilter/preserve_color: Add necessary headers

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Mon Sep 27 04:36:41 2021 +0200| [90546c6ca70ee2316f3d7f0a860297a3d0978b79] | committer: Andreas Rheinhardt

avfilter/preserve_color: Add necessary headers

Fixes checkheaders.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=90546c6ca70ee2316f3d7f0a860297a3d0978b79
---

 libavfilter/preserve_color.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavfilter/preserve_color.h b/libavfilter/preserve_color.h
index ac0587ad1e..158ee226bb 100644
--- a/libavfilter/preserve_color.h
+++ b/libavfilter/preserve_color.h
@@ -19,6 +19,10 @@
 #ifndef AVFILTER_PRESERVE_COLOR_H
 #define AVFILTER_PRESERVE_COLOR_H
 
+#include <math.h>
+
+#include "libavutil/macros.h"
+
 enum {
     P_NONE,
     P_LUM,