Enable Windows builds on Python 3.6; try to fix again.

appveyor.yml

@@ -52,6 +52,14 @@ environment:
       PYTHON_VERSION: "3.5"
       PYTHON_ARCH:    "64"
 
+    - PYTHON:         "C:\\Python36"
+      PYTHON_VERSION: "3.6"
+      PYTHON_ARCH:    "32"
+
+    - PYTHON:         "C:\\Python36-x64"
+      PYTHON_VERSION: "3.6"
+      PYTHON_ARCH:    "64"
+
 install:
   - "%PIP% install --disable-pip-version-check --user --upgrade pip"
   - "%PIP% install wheel twine"

mwparserfromhell/parser/ctokenizer/avl_tree.h

@@ -22,10 +22,17 @@
 #define _AVL_TREE_H_
 
 #include <stddef.h>
+
+#if defined(_MSC_VER) && (_MSC_VER < 1600)
+typedef unsigned long uintptr_t;
+#else
 #include <stdint.h>
+#endif
 
 #ifdef __GNUC__
 #  define AVL_INLINE inline __attribute__((always_inline))
+#elif defined(_MSC_VER) && (_MSC_VER < 1900)
+#  define AVL_INLINE __inline
 #else
 #  define AVL_INLINE inline
 #endif