include: Don't pack shellapi.h on 64-bit.

include/shellapi.h

diff --git a/include/shellapi.h b/include/shellapi.h
index 67e8923..930f261 100644
--- a/include/shellapi.h
+++ b/include/shellapi.h
@@ -23,7 +23,9 @@
 extern "C" {
 #endif /* defined(__cplusplus) */
 
+#ifndef _WIN64
 #include <pshpack1.h>
+#endif
 
 DECLARE_HANDLE(HDROP);
 
@@ -510,6 +512,8 @@
 } /* extern "C" */
 #endif /* defined(__cplusplus) */
 
+#ifndef _WIN64
 #include <poppack.h>
+#endif
 
 #endif /* __WINE_SHELLAPI_H */