BUG: Error messages of regtool are wrongly encoded

[Fujii Hironori]

Error messages of regtool can't be read, which are encoded in
SHIFT_JIS in Japanese Windows.

 $ regtool get /HKCU/hoge
Error (2): ▒w▒肳▒▒t▒@▒C▒▒▒▒▒▒▒▒▒▒܂▒▒▒B

 $ regtool get /HKCU/hoge 2>&1 | iconv -f shift_jis
Error (2): 指定されたファイルが見つかりません。


--- regtool.cc.orig 2017-05-16 17:20:32.671229600 +0900
+++ regtool.cc 2017-05-16 17:21:18.859375500 +0900
@@ -197,13 +197,13 @@
 void
 Fail (unsigned int rv)
 {
-  char *buf;
+  wchar_t *buf;
   if (!quiet)
     {
-      FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER
+      FormatMessageW (FORMAT_MESSAGE_ALLOCATE_BUFFER
      | FORMAT_MESSAGE_FROM_SYSTEM,
-     0, rv, 0, (CHAR *) & buf, 0, 0);
-      fprintf (stderr, "Error (%d): %s\n", rv, buf);
+     0, rv, 0, (WCHAR *)& buf, 0, 0);
+      fprintf (stderr, "Error (%d): %ls\n", rv, buf);
       LocalFree (buf);
     }
   exit (1);

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