prep: Update ppc_rom.bin

Functionally, this is a revert of Jocelyn's r3309 /
55aa45ddde3283cdd781326d001f7456bf02f684 (Quickly hack PowerPC BIOS
able to boot on CDROM again.), for which we do not have the sources.

Therefore the sources used are v0.4.1 plus pc-bios/ohw.diff plus a
workaround turning IDE errors into warnings.

Signed-off-by: Andreas Färber <andreas.faerber@web.de>

pc-bios/ppc_rom.bin

diff --git a/pc-bios/ppc_rom.bin b/pc-bios/ppc_rom.bin
index 0ad0282..d378d9a 100644
--- a/pc-bios/ppc_rom.bin
+++ b/pc-bios/ppc_rom.bin
Binary files differ

roms/openhackware

diff --git a/roms/openhackware b/roms/openhackware
index 4be9d6e..e9829b5 160000
--- a/roms/openhackware
+++ b/roms/openhackware
@@ -1 +1 @@
-Subproject commit 4be9d6e46808336623188417aa0f21d9d34b208a
+Subproject commit e9829b5584169ad14df2ca8776b87f4985aa9f06