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16-bit cleanliness patch from James H.

[originally from svn r8803]

--- a/keen.c

+++ b/keen.c

@@ -281,8 +281,8 @@

     for (box = 0; box < ctx->nboxes; box++) {

 	int *sq = ctx->boxlist + ctx->boxes[box];

 	int n = ctx->boxes[box+1] - ctx->boxes[box];

-	int value = ctx->clues[box] & ~CMASK;

-	int op = ctx->clues[box] & CMASK;

+	long value = ctx->clues[box] & ~CMASK;

+	long op = ctx->clues[box] & CMASK;

 	if (diff == DIFF_HARD) {

 	    for (i = 0; i < n; i++)