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Add a cast whose absence was causing a (-Werror-exacerbated) compile
warning on OS X.

[originally from svn r6037]

--- a/midend.c

+++ b/midend.c

@@ -1084,7 +1084,7 @@

 #define wr(h,s) do { \

     char hbuf[80]; \

     char *str = (s); \

-    sprintf(hbuf, "%-8.8s:%d:", (h), strlen(str)); \

+    sprintf(hbuf, "%-8.8s:%d:", (h), (int)strlen(str)); \

     write(wctx, hbuf, strlen(hbuf)); \

     write(wctx, str, strlen(str)); \

     write(wctx, "\n", 1); \