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More validation of solve moves in Flood

To avoid assertion failures while painting it, we need to ensure that
the purported solution in a solve move doesn't include filling with the
current top-left colour at any point.  That means checking the first
entry against the current top-left colours, and each later one against
its predecessor.

--- a/flood.c

+++ b/flood.c

@@ -945,6 +945,11 @@

                 return NULL;

             };

             sol->moves[i] = atoi(p);

+            if (i == 0 ?

+                sol->moves[i] == state->grid[FILLY * state->w + FILLX] :

+                sol->moves[i] == sol->moves[i-1])

+                /* Solution contains a fill with the current colour. */

+                goto badsolve;

             p += strspn(p, "0123456789");

             if (*p) {

                 if (*p != ',') goto badsolve;