Add OpenHack'Ware submodule

This replaces the ohw.diff file on top of v0.4.1.

Signed-off-by: Andreas Färber <andreas.faerber@web.de>
diff --git a/.gitmodules b/.gitmodules
index 45e51e7..444c24a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,6 +13,9 @@
 [submodule "roms/openbios"]
 	path = roms/openbios
 	url = git://git.qemu-project.org/openbios.git
+[submodule "roms/openhackware"]
+	path = roms/openhackware
+	url = git://git.qemu-project.org/openhackware.git
 [submodule "roms/qemu-palcode"]
 	path = roms/qemu-palcode
 	url = git://github.com/rth7680/qemu-palcode.git