cmake: check if Xt was found
npwrapper: link against X11 and dl
npwrapper: fix build on 32bit systems
npwrapper: fix flash loading on 32bit systems
npwrapper: add a path taken from ubuntu 12.10

adding also some comments
cef: remove ../lib subpathing
Merge pull request #458 from karolherbst/cmake

npwrapper bugfixes