Handle DragonFly BSD definitions in flash.h

There are still some tweaks necessary to get flashrom to build on
DragonFly, but this helps a lot.

Corresponding to flashrom svn r445.

Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/flash.h b/flash.h
index 59c6c47..e3cd49e 100644
--- a/flash.h
+++ b/flash.h
@@ -34,7 +34,7 @@
 #define __DARWIN__
 #endif
 
-#if defined(__FreeBSD__)
+#if defined(__FreeBSD__) || defined(__DragonFly__)
   #include <machine/cpufunc.h>
   #define off64_t off_t
   #define lseek64 lseek