riched20: remove duplicate declaration

[Austin English]

-- 
-Austin
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diff --git a/dlls/riched20/reader.c b/dlls/riched20/reader.c
index 02d4636..f7459ab 100644
--- a/dlls/riched20/reader.c
+++ b/dlls/riched20/reader.c
@@ -52,8 +52,6 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
 
-extern HANDLE me_heap;
-
 static int	_RTFGetChar(RTF_Info *);
 static void	_RTFGetToken (RTF_Info *);
 static void	_RTFGetToken2 (RTF_Info *);