splint: improve meta attributes

- don't repeat package name in description
- prefer licenses.gpl2Plus over free form "GPLv2+" license name
- add platform attribute so that splint will be available in the channel
strace: 4.7 -> 4.8

Also, update meta.license and add meta.platforms.
updating paraview to 4.0.1
nvidia-x11: Update to 325.15