Revert "do not include stdint.h unprotected"

This reverts commit cb6f7ea40e.

stdint.h can be included everywhere now that the Windows
platform generates and installs a stdint.h when Visual
Studio does not provide one.

Change-Id: Ia3cab28d7f5806203cd45227765debda54ac7472

lib/roken/strtoull.c

@@ -44,6 +44,7 @@
 #include <errno.h>
 #include <ctype.h>
 #include <stdlib.h>
+#include <stdint.h>
 
 /*
  * Convert a string to an unsigned long long integer.