Update Gnulib to v0.1-1157-gb03f418.

lib/wctype.in.h

@@ -1,6 +1,6 @@
 /* A substitute for ISO C99 <wctype.h>, for platforms that lack it.
 
-   Copyright (C) 2006-2016 Free Software Foundation, Inc.
+   Copyright (C) 2006-2017 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
@@ -25,13 +25,25 @@
  * wctrans_t, and wctype_t are not yet implemented.
  */
 
-#ifndef _@GUARD_PREFIX@_WCTYPE_H
-
 #if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
 #endif
 @PRAGMA_COLUMNS@
 
+#if (defined __MINGW32__ && defined __CTYPE_H_SOURCED__)
+
+/* Special invocation convention:
+   - With MinGW 3.22, when <ctype.h> includes <wctype.h>, only some part of
+     <wctype.h> is being processed, which doesn't include the idempotency
+     guard.   */
+
+#@INCLUDE_NEXT@ @NEXT_WCTYPE_H@
+
+#else
+/* Normal invocation convention.  */
+
+#ifndef _@GUARD_PREFIX@_WCTYPE_H
+
 #if @HAVE_WINT_T@
 /* Solaris 2.5 has a bug: <wchar.h> must be included before <wctype.h>.
    Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
@@ -93,10 +105,10 @@ _GL_INLINE_HEADER_BEGIN
 #  define WEOF -1
 # endif
 #else
-/* MSVC defines wint_t as 'unsigned short' in <crtdefs.h>.
+/* mingw and MSVC define wint_t as 'unsigned short' in <crtdefs.h>.
    This is too small: ISO C 99 section 7.24.1.(2) says that wint_t must be
    "unchanged by default argument promotions".  Override it.  */
-# if defined _MSC_VER
+# if @GNULIB_OVERRIDES_WINT_T@
 #  if !GNULIB_defined_wint_t
 #   include <crtdefs.h>
 typedef unsigned int rpl_wint_t;
@@ -512,3 +524,4 @@ _GL_INLINE_HEADER_END
 
 #endif /* _@GUARD_PREFIX@_WCTYPE_H */
 #endif /* _@GUARD_PREFIX@_WCTYPE_H */
+#endif