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fix gcc 6 warnings

#include <string.h>
#include "dietfeatures.h"

char *strrchr(const char *t, int c) {
  register char ch;
  register const char *l=0;

  ch = c;
  for (;;) {
    if (__unlikely(*t == ch)) l=t;
                                   if (__unlikely(!*t)) return (char*)l;
                                                                         ++t;
#ifndef WANT_SMALL_STRING_ROUTINES
    if (__unlikely(*t == ch)) l=t;
                                   if (__unlikely(!*t)) return (char*)l;
                                                                         ++t;
    if (__unlikely(*t == ch)) l=t;
                                   if (__unlikely(!*t)) return (char*)l;
                                                                         ++t;
    if (__unlikely(*t == ch)) l=t;
                                   if (__unlikely(!*t)) return (char*)l;
                                                                         ++t;
#endif
  }
  return (char*)l;
}

char *rindex(const char *t,int c)	__attribute__((weak,alias("strrchr")));