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Towers: Fix indentation of some solver code

gcc 6 warns about statements that are indented as if they were meant
to be part of a preceding conditional block.  In this case I don't
think that was intended, so shift it left.

References: https://bugs.debian.org/811577

--- a/towers.c

+++ b/towers.c

@@ -385,12 +385,12 @@

 	    return ret;

 #ifdef STANDALONE_SOLVER

-	    if (solver_show_working)

-		sprintf(prefix, "%*slower bounds for clue %s %d:\n",

-			solver_recurse_depth*4, "",

-			cluepos[c/w], c%w+1);

-	    else

-		prefix[0] = '\0';	       /* placate optimiser */

+	if (solver_show_working)

+	    sprintf(prefix, "%*slower bounds for clue %s %d:\n",

+		    solver_recurse_depth*4, "",

+		    cluepos[c/w], c%w+1);

+	else

+	    prefix[0] = '\0';	       /* placate optimiser */

 #endif

 	i = 0;