restore *.orig.c to each entry

Under each yyyy/dir there is a file of the form '*.orig.c'
containing the original source code, or as close as we can
get to the original source code.

2000/bellard/bellard.orig.c

@@ -0,0 +1,37 @@
+int m = 754974721, N, t[1 << 22], a, *p, i, e = 1 << 22, j, s, b, c, U;
+f (d)
+{
+  for (s = 1 << 23; s; s /= 2, d = d * 1LL * d % m)
+    if (s < N)
+      for (p = t; p < t + N; p += s)
+	for (i = s, c = 1; i; i--)
+	  b = *p + p[s], p[s] = (m + *p - p[s]) *
+	    1LL * c % m, *p++ = b % m, c = c * 1LL * d % m;
+  for (j = 0; i < N - 1;)
+    {
+      for (s = N / 2; !((j ^= s) & s); s /= 2);
+      if (++i < j)
+	a = t[i], t[i] = t[j], t[j] = a;
+    }
+}
+
+main ()
+{
+  *t = 2;
+  U = N = 1;
+  while (e /= 2)
+    {
+      N *= 2;
+      U = U * 1LL * (m + 1) / 2 % m;
+      f (362);
+      for (p = t; p < t + N;)
+	*p++ = (*p * 1LL ** p % m) * U % m;
+      f (415027540);
+      for (a = 0, p = t; p < t + N;)
+	a += (6972593 & e ? 2 : 1) ** p, *p++ = a % 10, a /= 10;
+    }
+  while (!*--p);
+  t[0]--;
+  while (p >= t)
+    printf ("%d", *p--);
+}