Always compile sherlock265 with position-independent code (required for Qt5, doesn't hurt for Qt4).
Don't include "moc_" files in source tarball, need to be built with detected Qt version.
"QtWidget" header file has moved in Qt5.
Check if found "moc" is from correct Qt.
Widgets code is in separate library for Qt5.
Merge pull request #83 from fancycode/qt5_fixes

Various fixes to properly support compilation against Qt5