qemu: update to 8.1.2

Changes:
- Update to 8.1.2
- Refresh patches
- Replace absent option --with-git-submodules with --disable-download

Fix #22530

Signed-off-by: Vladimir Ermakov <vooon341@gmail.com>

utils/qemu/patches/0001-configure-allow-disable-fortify_source.patch

@@ -11,9 +11,9 @@ OpenWrt base build system decide flavor of fortify_source to use
 
 --- a/configure
 +++ b/configure
-@@ -896,6 +896,8 @@ for opt do
+@@ -823,6 +823,8 @@ for opt do
    ;;
-   --disable-vfio-user-server) vfio_user_server="disabled"
+   --gdb=*) gdb_bin="$optarg"
    ;;
 +  --disable-fortify-source) fortify_source="no"
 +  ;;