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
Use "qtchooser" if available.
Delete moc-generated files on `make clean`.
fix video output with Qt5
Merge pull request #84 from fancycode/qt5_fixes

Use "qtchooser" if available.
Merge pull request #85 from fancycode/cleanup_moc_files

Delete moc-generated files on `make clean`.