Add tests/python_build to clang-format pre-commit hook ignore list

It had been ignored by misc/scripts/clang_format.sh since 388d35b74d but not the hook.

misc/hooks/pre-commit-clang-format

@@ -140,6 +140,9 @@ do
     if grep -q "\-so_wrap." <<< $file; then
         continue;
     fi
+    if grep -q "tests/python_build" <<< $file; then
+          continue;
+    fi
 
     # ignore file if we do check for file extensions and the file
     # does not match any of the extensions specified in $FILE_EXTS