Fix backward compatibility of AVIF_LOCAL_RAV1E (AOMediaCodec#1807)

CMakeLists.txt

@@ -43,7 +43,7 @@ option(AVIF_ENABLE_EXPERIMENTAL_AVIR "Enable experimental reduced header" OFF)
 function(set_local_or_system_option VAR DEFAULT TEXT)
     # Deal with the older way of setting options.
     if(DEFINED AVIF_LOCAL_${VAR})
-        if(AVIF_LOCAL_${CODEC})
+        if(AVIF_LOCAL_${VAR})
             set(DEFAULT "LOCAL")
         else()
             set(DEFAULT "SYSTEM")
@@ -68,7 +68,8 @@ function(set_codec_option CODEC NAME ENCDEC EXTRA)
     else()
         set(DEFAULT "OFF")
     endif()
-    set_local_or_system_option("CODEC_${CODEC}" ${DEFAULT} "Use the ${NAME} codec for ${ENCDEC}${EXTRA}")
+    set(AVIF_CODEC_${CODEC} ${DEFAULT} CACHE STRING "Use the ${NAME} codec for ${ENCDEC}${EXTRA}" FORCE)
+    set_property(CACHE AVIF_CODEC_${CODEC} PROPERTY STRINGS OFF LOCAL SYSTEM)
 endfunction()
 set_codec_option(AOM "AOM" "encoding/decoding" " (see AVIF_CODEC_AOM_DECODE/AVIF_CODEC_AOM_ENCODE)")
 set_codec_option(DAV1D "dav1d" "decoding" "")