Update examples

testsuite/eval/foreign_eval/Makefile

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+TOP=../../..
+include ../../foreign.mk

testsuite/eval/foreign_eval/README

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+run a string of Haskell code from a C program.

testsuite/eval/foreign_eval/expected

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+10946

testsuite/eval/foreign_eval/main.c

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+#include <stdio.h>
+
+#include "EvalHaskell.h"
+
+int main(int argc, char *argv[])
+{
+  int *p;
+  hs_init(&argc, &argv);
+  p = hs_eval_i("let fibs = 1:1:zipWith (+) fibs (tail fibs) in fibs !! 20 :: Int");
+  if (p == NULL)
+	  printf("failed!\n");
+  else
+	  printf("%d\n",*p);
+  hs_exit();
+  return 0;
+}