Fix: MSVC Debug Builds

Author: skottmckay

include/pybind11/pybind11.h

@@ -10,6 +10,23 @@
 
 #pragma once
 
+/* https://github.com/microsoft/onnxruntime/issues/9735#issuecomment-970718821
+ * The following block patches MSVC debug builds:
+ * Include Python header, disable linking to pythonX_d.lib on Windows in debug mode.
+ */
+#if defined(_MSC_VER)
+#    if (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 4)
+#        define HAVE_ROUND 1
+#    endif
+#    include <corecrt.h>
+#    pragma warning(push)
+#    pragma warning(disable : 4510 4610 4512 4005)
+#    if defined(_DEBUG) && !defined(Py_DEBUG)
+#        define PYBIND11_DEBUG_MARKER
+#        undef _DEBUG
+#    endif
+#endif
+
 #include "detail/class.h"
 #include "detail/init.h"
 #include "attr.h"