Move "longintrepr.h" inclusion before any user includes.

This solves the issue reported by Volker Braun where conflicting
using aliases of uint64_t would result in compile time errors.

Unfortunately, this also means that it's always included if
CYTHON_USE_PYLONG_INTERNALS is set, but it's a short header.

Cython/Utility/ModuleSetupCode.c

@@ -2,7 +2,7 @@
 
 #include <stddef.h> /* For offsetof */
 #ifndef offsetof
-#define offsetof(type, member) ( (size_t) & ((type*)0) -> member )
+  #define offsetof(type, member) ( (size_t) & ((type*)0) -> member )
 #endif
 
 #if !defined(WIN32) && !defined(MS_WINDOWS)
@@ -33,19 +33,22 @@
 #endif
 
 #ifdef PYPY_VERSION
-#define CYTHON_COMPILING_IN_PYPY 1
-#define CYTHON_COMPILING_IN_CPYTHON 0
+  #define CYTHON_COMPILING_IN_PYPY 1
+  #define CYTHON_COMPILING_IN_CPYTHON 0
 #else
-#define CYTHON_COMPILING_IN_PYPY 0
-#define CYTHON_COMPILING_IN_CPYTHON 1
+  #define CYTHON_COMPILING_IN_PYPY 0
+  #define CYTHON_COMPILING_IN_CPYTHON 1
 #endif
 
 #if !defined(CYTHON_USE_PYLONG_INTERNALS) && CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x02070000
-#define CYTHON_USE_PYLONG_INTERNALS 1
+  #define CYTHON_USE_PYLONG_INTERNALS 1
+#endif
+#if CYTHON_USE_PYLONG_INTERNALS
+  #include "longintrepr.h"
 #endif
 
 #if CYTHON_COMPILING_IN_PYPY && PY_VERSION_HEX < 0x02070600 && !defined(Py_OptimizeFlag)
-#define Py_OptimizeFlag 0
+  #define Py_OptimizeFlag 0
 #endif
 
 #define __PYX_BUILD_PY_SSIZE_T "n"

Cython/Utility/Optimize.c

@@ -467,7 +467,6 @@ bad:
 static PyObject* __Pyx__PyNumber_PowerOf2(PyObject *two, PyObject *exp, PyObject *none, int inplace); /*proto*/
 
 /////////////// PyNumberPow2 ///////////////
-//@requires: TypeConversion.c::PyLongInternals
 
 static PyObject* __Pyx__PyNumber_PowerOf2(PyObject *two, PyObject *exp, PyObject *none, int inplace) {
 // in CPython, 1<<N is substantially faster than 2**N
@@ -531,7 +530,6 @@ static PyObject* __Pyx_PyInt_{{op}}{{order}}(PyObject *op1, PyObject *op2, long
 #endif
 
 /////////////// PyIntBinop ///////////////
-//@requires: TypeConversion.c::PyLongInternals
 
 #if CYTHON_COMPILING_IN_CPYTHON
 {{py: from Cython.Utility import pylong_join }}
@@ -745,7 +743,6 @@ static PyObject* __Pyx_PyFloat_{{op}}{{order}}(PyObject *op1, PyObject *op2, dou
 #endif
 
 /////////////// PyFloatBinop ///////////////
-//@requires: TypeConversion.c::PyLongInternals
 
 #if CYTHON_COMPILING_IN_CPYTHON
 {{py: from Cython.Utility import pylong_join }}

Cython/Utility/StringTools.c

@@ -735,7 +735,6 @@ static CYTHON_INLINE PyObject* __Pyx_PyBytes_Join(PyObject* sep, PyObject* value
 static CYTHON_INLINE int __Pyx_PyByteArray_AppendObject(PyObject* bytearray, PyObject* value);
 
 //////////////////// ByteArrayAppendObject ////////////////////
-//@requires: TypeConversion.c::PyLongInternals
 //@requires: ByteArrayAppend
 
 static CYTHON_INLINE int __Pyx_PyByteArray_AppendObject(PyObject* bytearray, PyObject* value) {

Cython/Utility/TypeConversion.c

@@ -175,7 +175,6 @@ bad:
 #endif
 
 /////////////// TypeConversions ///////////////
-//@requires: PyLongInternals
 
 /* Type Conversion Functions */
 
@@ -589,20 +588,12 @@ static CYTHON_INLINE PyObject* {{TO_PY_FUNCTION}}({{TYPE}} value) {
     }
 
 
-/////////////// PyLongInternals ///////////////
-
-#if CYTHON_USE_PYLONG_INTERNALS
-  #include "longintrepr.h"
-#endif
-
-
 /////////////// CIntFromPy.proto ///////////////
 
 static CYTHON_INLINE {{TYPE}} {{FROM_PY_FUNCTION}}(PyObject *);
 
 /////////////// CIntFromPy ///////////////
 //@requires: CIntFromPyVerify
-//@requires: PyLongInternals
 
 {{py: from Cython.Utility import pylong_join }}