add compiled seabios 1.7.5 image into Bochs tree along with Bochs bios images. Confirmed that seabios 1.7.5 image works with current Bochs version

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12357 6c8e4198-a580-4521-a02f-c9ae86df1db9