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64-bit cleanliness: we were already carefully using a uint32 type in
the SHA code, but it wasn't correctly defined!

[originally from svn r7817]

--- a/puzzles.h

+++ b/puzzles.h

@@ -7,6 +7,7 @@

 #include <stdio.h>  /* for FILE */

 #include <stdlib.h> /* for size_t */

+#include <limits.h> /* for UINT_MAX */

 #ifndef TRUE

 #define TRUE 1

@@ -331,7 +332,14 @@

 char *random_state_encode(random_state *state);

 random_state *random_state_decode(char *input);

 /* random.c also exports SHA, which occasionally comes in useful. */

+#if __STDC_VERSION__ >= 199901L

+#include <stdint.h>

+typedef uint32_t uint32;

+#elif UINT_MAX >= 4294967295L

+typedef unsigned int uint32;

+#else

 typedef unsigned long uint32;

+#endif

 typedef struct {

     uint32 h[5];

     unsigned char block[64];