Rename Direct I/O library to DirectHW

The Direct I/O library for Mac OS X is now called DirectHW to make sure
people can find it via an internet search.

DirectIO was a generic name for a concept and thus not a good
distinguisher for a library.

Corresponding to flashrom svn r1198.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Idwer Vollering <vidwer@gmail.com>
diff --git a/hwaccess.h b/hwaccess.h
index 9bf37f2..63a2bf2 100644
--- a/hwaccess.h
+++ b/hwaccess.h
@@ -193,6 +193,7 @@
   #define INL(x) __extension__ ({ u_int inl_tmp = (x); inl(inl_tmp); })
 #else
 #if defined(__DARWIN__)
+    /* Header is part of the DirectHW library. */
     #include <DirectIO/darwinio.h>
     #define off64_t off_t
     #define lseek64 lseek