QEMU source code with CRLF line endings
which is quite common on windows hosts
fails with current make_device_config.sh.

The awk script gets the name of the included
file with \r, so instead of pci.mak it will
search for pci.mak\r which of course does
not work.

Fix this by removing any \r.

v2:
    Avoid using sub() and \r with awk because they are unsupported
    on some platforms. Use tr to remove \r. This new solution
    improves portability and was suggested by Paolo Bonzini.
Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Acked-by: NAndreas Färber <andreas.faerber@web.de>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

Terminate make_device_config.sh if the awk command fails.
Typically this means a missing file.
Signed-off-by: NPaul Brook <paul@codesourcery.com>

Allow default configs to be split into several files.
Signed-off-by: NPaul Brook <paul@codesourcery.com>