fix code duplication in fetchdecode modules

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@11944 6c8e4198-a580-4521-a02f-c9ae86df1db9
remove unneeded vga keyword from lexer

git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@11945 6c8e4198-a580-4521-a02f-c9ae86df1db9