relicense to LGPLv2+

OK, as:

cullmann@altair:/local/cullmann/kf5/src/kate> ../kde-dev-scripts/relicensecheck.pl part/search/katematch.cpp
Need permission for licensing:

Summary:

Relicensing allowed: lgplv23 gplv23 +eV lgplv2+ gplv2+

Do not forget to check copyright headers and for patches committed in the name of others!

was before:

part/search/katematch.cpp;LibraryGPLv2