do not include stdint.h unprotected

In most cases stdint.h should be inherited from roken.h.
In those cases where it cannot be, it must be protected by
  #ifdef HAVE_STDINT_H

Change-Id: I46cbaeab1d65939468f84179aeeef7e4f898b0bb

lib/roken/strtoull.c

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