Avoid const-ness compiler warning in __Pyx_PyObject_AsWritableString

This avoids the compiler warning
  warning: cast discards ‘const’ qualifier from pointer target type [-Wcast-qual]
by casting the pointer to uintptr_t before removing the const-ness.

The warning was introduced in 6cd70f09

Also merge the two places that define stdint types.

Cython/Utility/ModuleSetupCode.c

@@ -259,15 +259,31 @@
 #ifdef _MSC_VER
     #ifndef _MSC_STDINT_H_
         #if _MSC_VER < 1300
-           typedef unsigned char     uint8_t;
-           typedef unsigned int      uint32_t;
+            typedef unsigned char     uint8_t;
+            typedef unsigned short    uint16_t;
+            typedef unsigned int      uint32_t;
         #else
-           typedef unsigned __int8   uint8_t;
-           typedef unsigned __int32  uint32_t;
+            typedef unsigned __int8   uint8_t;
+            typedef unsigned __int16  uint16_t;
+            typedef unsigned __int32  uint32_t;
+        #endif
+    #endif
+    #if _MSC_VER < 1300
+        #ifdef _WIN64
+            typedef unsigned long long  __pyx_uintptr_t;
+        #else
+            typedef unsigned int        __pyx_uintptr_t;
+        #endif
+    #else
+        #ifdef _WIN64
+            typedef unsigned __int64    __pyx_uintptr_t;
+        #else
+            typedef unsigned __int32    __pyx_uintptr_t;
         #endif
     #endif
 #else
-   #include <stdint.h>
+    #include <stdint.h>
+    typedef uintptr_t  __pyx_uintptr_t;
 #endif
 
 

Cython/Utility/TypeConversion.c

@@ -68,9 +68,9 @@ static CYTHON_INLINE PyObject* __Pyx_PyUnicode_FromString(const char*);
 #define __Pyx_PyBytes_AsString(s)     ((const char*) PyBytes_AS_STRING(s))
 #define __Pyx_PyBytes_AsSString(s)    ((const signed char*) PyBytes_AS_STRING(s))
 #define __Pyx_PyBytes_AsUString(s)    ((const unsigned char*) PyBytes_AS_STRING(s))
-#define __Pyx_PyObject_AsWritableString(s)    ((char*) __Pyx_PyObject_AsString(s))
-#define __Pyx_PyObject_AsWritableSString(s)    ((signed char*) __Pyx_PyObject_AsString(s))
-#define __Pyx_PyObject_AsWritableUString(s)    ((unsigned char*) __Pyx_PyObject_AsString(s))
+#define __Pyx_PyObject_AsWritableString(s)    ((char*)(__pyx_uintptr_t) __Pyx_PyObject_AsString(s))
+#define __Pyx_PyObject_AsWritableSString(s)    ((signed char*)(__pyx_uintptr_t) __Pyx_PyObject_AsString(s))
+#define __Pyx_PyObject_AsWritableUString(s)    ((unsigned char*)(__pyx_uintptr_t) __Pyx_PyObject_AsString(s))
 #define __Pyx_PyObject_AsSString(s)    ((const signed char*) __Pyx_PyObject_AsString(s))
 #define __Pyx_PyObject_AsUString(s)    ((const unsigned char*) __Pyx_PyObject_AsString(s))
 #define __Pyx_PyObject_FromCString(s)  __Pyx_PyObject_FromString((const char*)s)
@@ -708,18 +708,6 @@ static CYTHON_INLINE PyObject* {{TO_PY_FUNCTION}}({{TYPE}} value, Py_ssize_t wid
 //@requires: StringTools.c::BuildPyUnicode
 //@requires: CIntToDigits
 
-#ifdef _MSC_VER
-    #ifndef _MSC_STDINT_H_
-        #if _MSC_VER < 1300
-           typedef unsigned short    uint16_t;
-        #else
-           typedef unsigned __int16  uint16_t;
-        #endif
-    #endif
-#else
-   #include <stdint.h>
-#endif
-
 // NOTE: inlining because most arguments are constant, which collapses lots of code below
 
 static CYTHON_INLINE PyObject* {{TO_PY_FUNCTION}}({{TYPE}} value, Py_ssize_t width, char padding_char, char format_char) {