Fix quoting in config.status patch series.

[Ralf Wildenhues]

Hello,

I've worked on the long-pending patch series by Benoit Sigoure 
(which has been commented upon and reworked a couple of times).
It now passes on GNU/Linux, MinGW, and Cygwin, and so I figured
it's ok to go ahead and commit it, and do necessary further
cleanups in followup patches.  I believe to have incorporated
all comments that were done to earlier versions of the patches.

I'll be replying with the patches that I applied, including
comments to what changed.

Cheers,
Ralf