Disable parallel builds in the 0.29.x branch since they currently misbehave...

Disable parallel builds in the 0.29.x branch since they currently misbehave and fail in CI, trying to rebuild everything multiple times in parallel.

Tools/ci-run.sh

@@ -124,8 +124,8 @@ if [[ $NO_CYTHON_COMPILE != "1" && $PYTHON_VERSION != "pypy"* ]]; then
   if [[ $CYTHON_COMPILE_ALL == "1" ]]; then
     SETUP_ARGS="$SETUP_ARGS --cython-compile-all"
   fi
-  SETUP_ARGS="$SETUP_ARGS
-    $(python -c 'import sys; print("-j5" if sys.version_info >= (3,5) else "")')"
+  #SETUP_ARGS="$SETUP_ARGS
+  #  $(python -c 'import sys; print("-j5" if sys.version_info >= (3,5) else "")')"
 
   CFLAGS=$BUILD_CFLAGS \
     python setup.py build_ext -i $SETUP_ARGS || exit 1