SIMD should now work on 64-bit Windows


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4048 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/jpeg/jdhuff.h b/common/jpeg/jdhuff.h
index b192e48..0a242c5 100644
--- a/common/jpeg/jdhuff.h
+++ b/common/jpeg/jdhuff.h
@@ -73,7 +73,7 @@
  * necessary.
  */
 
-#if __WORDSIZE == 64
+#if __WORDSIZE == 64 || defined(_WIN64)
 
 typedef size_t bit_buf_type;	/* type of bit-extraction buffer */
 #define BIT_BUF_SIZE  64		/* size of buffer in bits */