Merge remote-tracking branch 'remotes/kraxel/tags/pull-seabios-1.8.1-20150316-1' into staging

seabios: update to 1.8.1 stable release

# gpg: Signature made Mon Mar 16 08:09:25 2015 GMT using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-seabios-1.8.1-20150316-1:
  seabios: update to 1.8.1 stable release
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

seabios @ 4adadbde

-Subproject commit 4c59f5d83044df4d57b90958b0fdfcecb913fddb
+Subproject commit 4adadbde6904807de2e990c0af839ad0cc977806