set CMAKE_DL_LIBS if our toolchain-file for mingw is used
set locale for output stream

fixes #159
simplify the debian build scripts

* Parallel build of python2+python3 has been fixed, so there's no need to
  specify the paths anymore
* Debian 7 has QT 5.3 in backports. Use it!
* Java 8 can be easily installed using webupd8
  (http://www.webupd8.org/2014/03/how-to-install-oracle-java-8-in-debian.html)
Merge branch 'master' of github.com:ElektraInitiative/libelektra