branches/zip: Fix two more bogus MSVC C4090 warnings on constness differences

(Warning C4090 is incorrectly issued when using Visual C++ .NET 2003,
bug 101661, http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=101661)

dict_table_find_equivalent_index(): Cast away constness in the mem_free()
call.  MSVC seems to think that an array of pointers to const data is
const itself.

UT_SORT_FUNCTION_BODY(): Cast away constness in the memcpy() call.
MSVC seems to think that an array of pointers to const data is const itself.

dict/dict0dict.c

@@ -4484,7 +4484,7 @@ dict_table_find_equivalent_index(
 		table, column_names, index->n_fields,
 		index, TRUE, FALSE);
 
-	mem_free(column_names);
+	mem_free((void*) column_names);
 
 	return(equiv_index);
 }

include/ut0sort.h

@@ -80,7 +80,7 @@ two elements from the array and returns 1, if the first is bigger,
 		}\
 	}\
 \
-	memcpy((ARR) + (LOW), (AUX_ARR) + (LOW),\
+	memcpy((void*) ((ARR) + (LOW)), (AUX_ARR) + (LOW),\
 	       ((HIGH) - (LOW)) * sizeof *(ARR));\
 }\