For -R and after chdir, add the current directory to the path

Merged Peter Hutterer requested to merge whot/xkbcomp:wip/chdir into master

This restores the behavior pre 1aecdffa, at least when -R is given. For a normal invocation without -R we don't add the current directory, because 1aecdffa isn't totally wrong about whether that's a good idea.

Fixes #3 (closed)

I'll need the reporter to test this though before merging.

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