Declare 64-bit stdint types as long long.

I don't know of any platforms where sizeof(long long) == 64, and this
is needed for unsigned long + int64_t on LLP64.

This may pose a problem if sizeof(uintmax_t) > 64.

Cython/Includes/libc/stdint.pxd

@@ -13,7 +13,7 @@ cdef extern from "stdint.h" nogil:
     ctypedef unsigned char  uint8_t
     ctypedef unsigned short uint16_t
     ctypedef unsigned int   uint32_t
-    ctypedef unsigned long  uint64_t
+    ctypedef unsigned long long uint64_t
     # 7.18.1.2 Minimum-width integer types
     ctypedef   signed char  int_least8_t
     ctypedef   signed short int_least16_t
@@ -22,7 +22,7 @@ cdef extern from "stdint.h" nogil:
     ctypedef unsigned char  uint_least8_t
     ctypedef unsigned short uint_least16_t
     ctypedef unsigned int   uint_least32_t
-    ctypedef unsigned long  uint_least64_t
+    ctypedef unsigned long long uint_least64_t
     # 7.18.1.3 Fastest minimum-width integer types
     ctypedef   signed char  int_fast8_t
     ctypedef   signed short int_fast16_t
@@ -31,7 +31,7 @@ cdef extern from "stdint.h" nogil:
     ctypedef unsigned char  uint_fast8_t
     ctypedef unsigned short uint_fast16_t
     ctypedef unsigned int   uint_fast32_t
-    ctypedef unsigned long  uint_fast64_t
+    ctypedef unsigned long long uint_fast64_t
     # 7.18.1.4 Integer types capable of holding object pointers
     ctypedef ssize_t intptr_t
     ctypedef  size_t uintptr_t