riched20: make sure to load dll below 2GB address space

[Austin English]

-- 
-Austin
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--- a/dlls/riched20/Makefile.in	
+++ a/dlls/riched20/Makefile.in	
@@ -1,6 +1,7 @@ 
 MODULE    = riched20.dll
 IMPORTLIB = riched20
 IMPORTS   = uuid ole32 oleaut32 imm32 user32 gdi32
+EXTRADLLFLAGS = -Wl,--image-base,0x7ac00000
 
 C_SRCS = \
 	caret.c \