build-busybox: Disable CONFIG_FEATURE_FAIL_IF_UTF8_MANIFEST_UNSUPPORTED

This allows running the built busybox on older versions of
Windows that don't support the utf8 manifest. (The utf8 manifest
is supported since Windows 10 update 1903.)

build-busybox.sh

@@ -73,6 +73,7 @@ mkdir -p $BUILDDIR
 make mingw64a_defconfig O=$BUILDDIR -j$CORES
 cd $BUILDDIR
 sed -ri 's/^(CONFIG_AR)=y/\1=n/' .config
+sed -ri 's/^(CONFIG_FEATURE_FAIL_IF_UTF8_MANIFEST_UNSUPPORTED)=y/\1=n/' .config
 $MAKE -j$CORES CROSS_COMPILE=${HOST+$HOST-}
 cp ../LICENSE $PREFIX/LICENSE.txt
 mkdir -p $PREFIX/bin