Remove writable-strings support.

diff --git a/include/winnt.h b/include/winnt.h
index 25b4edb..8d62c84 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -337,49 +337,11 @@
  * macro which only exists in the user's code.
  */
 #ifndef __WINESRC__
-# ifdef WINE_UNICODE_REWRITE
-
-/* Use this if your compiler does not provide a 16bit wchar_t type.
- * Note that you will need to specify -fwritable-strings or an option
- * to this effect.
- * In C++ both WINE_UNICODE_TEXT('c') and WINE_UNICODE_TEXT("str") are
- * supported, but only the string form can be supported in C.
- */
-EXTERN_C unsigned short* wine_rewrite_s4tos2(const wchar_t* str4);
-#  ifdef __cplusplus
-inline WCHAR* wine_unicode_text(const wchar_t* str4)
-{
-  return (WCHAR*)wine_rewrite_s4tos2(str4);
-}
-inline WCHAR wine_unicode_text(wchar_t chr4)
-{
-  return (WCHAR)chr4;
-}
-#   define WINE_UNICODE_TEXT(x)       wine_unicode_text(L##x)
-#  else  /* __cplusplus */
-#   define WINE_UNICODE_TEXT(x)       ((WCHAR*)wine_rewrite_s4tos2(L##x))
-#  endif  /* __cplusplus */
-
-# else  /* WINE_UNICODE_REWRITE */
-
-/* Define WINE_UNICODE_NATIVE if:
- * - your compiler provides a 16bit wchar_t type, e.g. gcc >= 2.96 with
- *   -fshort-wchar option
- * - or if you decide to use the native 32bit Unix wchar_t type. Be aware
- *   though that the Wine APIs only support 16bit WCHAR characters for
- *   binary compatibility reasons.
- * - or define nothing at all if you don't use Unicode, and blissfully
- *   ignore the issue :-)
- */
-#  define WINE_UNICODE_TEXT(string)   L##string
-
-# endif  /* WINE_UNICODE_REWRITE */
-
 # ifdef UNICODE
 typedef WCHAR           TCHAR,      *PTCHAR;
 typedef LPWSTR          PTSTR,       LPTSTR;
 typedef LPCWSTR         PCTSTR,      LPCTSTR;
-#  define __TEXT(string) WINE_UNICODE_TEXT(string)
+#  define __TEXT(string) L##string
 # else  /* UNICODE */
 typedef CHAR            TCHAR,      *PTCHAR;
 typedef LPSTR           PTSTR,       LPTSTR;