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/Makefile b/Makefile
index e83fc0b..54f04b9 100644
--- a/Makefile
+++ b/Makefile
@@ -42,6 +42,7 @@
 endif
 ifeq ($(OS_ARCH), Darwin)
 CPPFLAGS += -I/opt/local/include -I/usr/local/include
+# DirectIO framework can be found in the DirectHW library.
 LDFLAGS += -framework IOKit -framework DirectIO -L/opt/local/lib -L/usr/local/lib
 endif
 ifeq ($(OS_ARCH), FreeBSD)