FindLibXslt: provide imported targets
- Add imported target
LibXslt::LibXslt
forlibxslt
library - Add imported target
LibXslt::LibExslt
forlibexslt
library - Add imported target
LibXslt::xsltproc
forxsltproc
executable - Add unit test for module
FindLibXslt.cmake
Topic-rename: FindLibXslt-targets