Fixes #123 issue.

On Windows, Oracle client library is deployed as oci.dll, but not named as
libclntsh.so. This also refines fix already available in 'develop' from
SHA: f7fdb356394949a8409a15e51f255601ca27660a
Close #124 pull request as merged.

(Original commit message amended by Mateusz Loskot)
Add latest hotfix to CHANGES