Fix missing uint64_t definition in parsers.c under Windows

mercurial/parsers.c

@@ -137,6 +137,7 b' quit:'
 /* msvc 6.0 has problems */
 #  define inline __inline
 typedef unsigned long uint32_t;
+typedef unsigned __int64 uint64_t;
 # else
 #  include <stdint.h>
 # endif