Fix test suite issues with iso8859-1 parameters 

I fixed the two failing test scripts following Karsten's hint from here:
2482bc9#commitcomment-5946968

I had this as one commit originally (kasal:test-fix) but changed that to contain reverts.

I found a similar fix in t4205, so I updated it and added a comment.

Out of curiosity:
What about 1.9.1? Are you going to rebase the msysgit-specific patches? Should the reverted ones get dropped?