qemu: update to 6.1.0, add usb passthrough option

One of big change is that QEMU has switched to Meson build system.
That result in few changes to build scripts to fix python interpreter
usage.
Second change that it's not possible to select binaries to build, so
now we have to build all targets at once (that require --enable-tools).

Options --disable-sheepdog and --disable-vxhs was removed from qemu
6.1.0 and 6.0.0 accordingly.

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
-@@ -1601,6 +1601,8 @@ for opt do
+@@ -1581,6 +1581,8 @@ for opt do
    ;;
-   --gdb=*) gdb_bin="$optarg"
+   --disable-slirp-smbd) slirp_smbd=no
    ;;
 +  --disable-fortify-source) fortify_source="no"
 +  ;;