Set CONFIG_AV1_DECODER or CONFIG_AV1_ENCODER to 0

If AVIF_CODEC_AOM_DECODE is OFF, set CONFIG_AV1_DECODER to 0. Similarly
for CONFIG_AV1_ENCODER.
diff --git a/cmake/Modules/LocalAom.cmake b/cmake/Modules/LocalAom.cmake
index d72ba6e..40ec795 100644
--- a/cmake/Modules/LocalAom.cmake
+++ b/cmake/Modules/LocalAom.cmake
@@ -109,6 +109,14 @@
         )
     endif()
 
+    if(NOT AVIF_CODEC_AVM)
+        if(NOT AVIF_CODEC_AOM_DECODE)
+            set(CONFIG_AV1_DECODER 0 CACHE INTERNAL "")
+        endif()
+        if(NOT AVIF_CODEC_AOM_ENCODE)
+            set(CONFIG_AV1_ENCODER 0 CACHE INTERNAL "")
+        endif()
+    endif()
     set(CONFIG_PIC 1 CACHE INTERNAL "")
     if(libyuv_FOUND)
         set(CONFIG_LIBYUV 0 CACHE INTERNAL "")