Remove a redundant file in utils.

At some point while setting up the utils subdirectory, I apparently
only got half way through renaming miscucs.c to dup_mb_to_wc.c: I
created the new copy of the file, but I didn't delete the old one, I
didn't mention it in utils/CMakeLists.txt, and I didn't change the
comment at the top.

Now done all three, so we now have just one copy of this utility
module.

utils/CMakeLists.txt

@@ -16,6 +16,7 @@ add_sources_from_current_dir(utils
   dupcat.c
   dupprintf.c
   dupstr.c
+  dup_mb_to_wc.c
   encode_utf8.c
   encode_wide_string_as_utf8.c
   fgetline.c
@@ -28,7 +29,6 @@ add_sources_from_current_dir(utils
   marshal.c
   memory.c
   memxor.c
-  miscucs.c
   null_lp.c
   nullseat.c
   nullstrcmp.c

utils/dup_mb_to_wc.c

@@ -1,7 +1,8 @@
 /*
- * Centralised Unicode-related helper functions, separate from misc.c
- * so that they can be omitted from tools that aren't including
- * Unicode handling.
+ * dup_mb_to_wc: memory-allocating wrapper on mb_to_wc.
+ *
+ * Also dup_mb_to_wc_c: same but you already know the length of the
+ * string.
  */
 
 #include "putty.h"

utils/miscucs.c

@@ -1,28 +0,0 @@
-/*
- * Centralised Unicode-related helper functions, separate from misc.c
- * so that they can be omitted from tools that aren't including
- * Unicode handling.
- */
-
-#include "putty.h"
-#include "misc.h"
-
-wchar_t *dup_mb_to_wc_c(int codepage, int flags, const char *string, int len)
-{
-    int mult;
-    for (mult = 1 ;; mult++) {
-        wchar_t *ret = snewn(mult*len + 2, wchar_t);
-        int outlen;
-        outlen = mb_to_wc(codepage, flags, string, len, ret, mult*len + 1);
-        if (outlen < mult*len+1) {
-            ret[outlen] = L'\0';
-            return ret;
-        }
-        sfree(ret);
-    }
-}
-
-wchar_t *dup_mb_to_wc(int codepage, int flags, const char *string)
-{
-    return dup_mb_to_wc_c(codepage, flags, string, strlen(string));
-}