[libKML]: 1) Copy shared libraries on Linux.
2) Fixed typo in gcs.pri which prevented QMAKE_LFLAGS from
woring on all Linux platforms.
Add additional lib.
Merge pull request #955 from kubark42/libkml-copy-libraries

Copies shared libraries on Linux.
[libKML]: As reported in https://github.com/TauLabs/TauLabs/issues/816,
the file export will fail for extended character sets. This forces the
character set to be local, and returns an error if this is not possible.