drop superfluous libexecdir (#1360)

[Elan Ruusamäe]

also, each PR contains links below "merge using commandline" -- you could do
those commands, except push, and do extra commits with git amend to the
"merge" commit. then all features work:

1. you could do your amend, which be visible as diff of the "merge commit"
2. merge commit is there for github
3. original commits from reporter are unaltered

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