Make xine-config --version parsing more robust

I think there's quite a bit more room for improvement in the sed expression:

1) The expression is not bound to start/end of line, and will thus pass
possible leading/trailing garbage through.

2) It uses plain "." (== any character as far as sed is concerned) where it
appears to search for the literal ".".

3) The whole "xine-config --version" output is assigned to all
xine_config_*_version vars if there's no match. I think more intuitive would
be them to be empty if parsing fails.

4) It uses * (0 or more) for matching digit sequences, where I think + (1 or
more) would be desirable.

This patch should fix issues 1 to 3. I suppose for 4) it would additionally
take only replacing the first three "*" with "\+" but IIRC there are some
portability issues related to "+" between different sed versions.

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