avcodec/libsvtav1: remove version check macro workaround

The current minimum supported version defines the macro.
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/libsvtav1.c

@@ -37,10 +37,6 @@
 #include "avcodec.h"
 #include "profiles.h"
 
-#ifndef SVT_AV1_CHECK_VERSION
-#define SVT_AV1_CHECK_VERSION(major, minor, patch) 0
-#endif
-
 typedef enum eos_status {
     EOS_NOT_REACHED = 0,
     EOS_SENT,