Bug#492121: probable fix for 492121

[peter green <plugwash@p10link.net>]

I think adding the following to the work target in debian/rules just 
before the last line should make this package build succesfully

cp /usr/share/misc/config.sub work.tmp
cp /usr/share/misc/config.guess work.tmp

Unfortunately since I have been unable to reproduce the problem (it 
seems to be specific to 64 bit mips and qemu-system-mips64 seems very 
slow and crash prone) I cannot confirm if this fix works or not.