Fix X11 and rust build on arm64

scripts.d/45-x11/60-libxv.sh

@@ -5,7 +5,6 @@ LIBXV_COMMIT="03a6f599d060591a9a7cd8558bd2143a1c7c70d7"
 
 ffbuild_enabled() {
     [[ $TARGET != linux* ]] && return -1
-    [[ $TARGET == linuxarm64 ]] && return -1
     [[ $ADDINS_STR == *4.4* ]] && return -1
     return 0
 }
@@ -24,6 +23,12 @@ ffbuild_dockerbuild() {
         --without-lint
     )
 
+    if [[ $TARGET == linuxarm64 ]]; then
+        myconf+=(
+            --disable-malloc0returnsnull
+        )
+    fi
+
     if [[ $TARGET == linux* ]]; then
         myconf+=(
             --host="$FFBUILD_TOOLCHAIN"