autogen: fix imports in libusb (#11294)

autogen_stubs.sh

@@ -444,7 +444,7 @@ generate_libusb() {
     -o $BASE/libusb.py
 
   fixup $BASE/libusb.py
-  sed -i "s\import ctypes\import ctypes, os\g" $BASE/libusb.py
+  sed -i "s\import ctypes\import ctypes, ctypes.util, os\g" $BASE/libusb.py
   sed -i "s/FIXME_STUB/libusb/g" "$BASE/libusb.py"
   sed -i "s/libusb_le16_to_cpu = libusb_cpu_to_le16//g" "$BASE/libusb.py"
   sed -i "s/FunctionFactoryStub()/None if (lib_path:=os.getenv('LIBUSB_PATH', ctypes.util.find_library('usb-1.0'))) is None else ctypes.CDLL(lib_path)/g" "$BASE/libusb.py"

tinygrad/runtime/autogen/libusb.py

@@ -6,7 +6,7 @@
 # POINTER_SIZE is: 8
 # LONGDOUBLE_SIZE is: 16
 #
-import ctypes, os
+import ctypes, ctypes.util, os
 
 
 class FunctionFactoryStub: