wip: Fix CI failure #3

Author: EricCousineau-TRI

include/pybind11/numpy_ufunc.h

@@ -202,6 +202,7 @@ class ufunc : public object {
         // Determine if we need to make a new ufunc.
         bool is_core = true;
         for (int i = 0; i < N; ++i) {
+            size_t is = static_cast<size_t>(i);
             if (dtype_args[i] >= detail::npy_api::constants::NPY_USERDEF_)
                 is_core = false;
         }

setup.py

@@ -17,6 +17,7 @@
         'include/pybind11/detail/common.h',
         'include/pybind11/detail/descr.h',
         'include/pybind11/detail/init.h',
+        'include/pybind11/detail/inference.h',
         'include/pybind11/detail/internals.h',
         'include/pybind11/detail/typeid.h',
         'include/pybind11/attr.h',
@@ -31,6 +32,8 @@
         'include/pybind11/functional.h',
         'include/pybind11/iostream.h',
         'include/pybind11/numpy.h',
+        'include/pybind11/numpy_dtypes_user.h',
+        'include/pybind11/numpy_ufunc.h',
         'include/pybind11/operators.h',
         'include/pybind11/options.h',
         'include/pybind11/pybind11.h',