find dll path on Windows

When running tests on Windows (or for devenv), paths of shared
libraries need to be added to the PATH envvar for Windows to
be able to find them. Meson is currently using the path of the
import lib, which is wrong in many cases.

This fix does two things: if there is a variable bindir
in the pkg-config file, those variable
values are added to the list of path. This is for conan
dependencies, if conan decides to export those paths.
See https://github.com/conan-io/conan/issues/13532 .

The fallback is to replace `lib` by `bin` in the import
library path. This heuristic will work most of the time
(but the bin directory could have a different name,
or the dll itself could have a different name). In all cases,
it cannot be worse than current implementation, and it
solves many cases.

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