[cmake-developers] CTest update broken with non-ASCII filenames

[Nils Gladitz]

With c771f9d945444f6cfe41195e26653f368aff7f42 "CTest: To enforce the C 
locale use LC_ALL instead of LC_MESSAGES."
I broke svn updates for repositories which contain non-ASCII filenames.

This is apparently due to me not only changing how messages are encoded 
but also how svn interprets filename encodings.

I'll try to find a more appropriate fix.

Nils