Revert "WIN32 MemoryTracking: track wcsdup() _wcsdup() and _tcsdup() usage"

This reverts commit 8ec2cb5544.

We don't have any code anywhere in libcurl (or the curl tool) that use
wcsdup so there's no such memory use to track. It seems to cause mild
problems with the Borland compiler though that we may avoid by reverting
this change again.

Bug: http://curl.haxx.se/mail/lib-2013-05/0070.html

lib/easy.c

@@ -198,9 +198,6 @@ curl_free_callback Curl_cfree = (curl_free_callback)free;
 curl_realloc_callback Curl_crealloc = (curl_realloc_callback)realloc;
 curl_strdup_callback Curl_cstrdup = (curl_strdup_callback)system_strdup;
 curl_calloc_callback Curl_ccalloc = (curl_calloc_callback)calloc;
-#ifdef WIN32
-curl_wcsdup_callback Curl_cwcsdup = (curl_wcsdup_callback)wcsdup;
-#endif
 #else
 /*
  * Symbian OS doesn't support initialization to code in writeable static data.
@@ -232,9 +229,6 @@ CURLcode curl_global_init(long flags)
   Curl_crealloc = (curl_realloc_callback)realloc;
   Curl_cstrdup = (curl_strdup_callback)system_strdup;
   Curl_ccalloc = (curl_calloc_callback)calloc;
-#ifdef WIN32
-  Curl_cwcsdup = (curl_wcsdup_callback)wcsdup;
-#endif
 
   if(flags & CURL_GLOBAL_SSL)
     if(!Curl_ssl_init()) {