shell namespace pollution with /etc/profile.d/kde.{csh,sh} in RHEL 7.

Issue

• Due to a change for RHEL7, the file /etc/profile.d/kde.sh and kde.csh are now leaving the shell variable libdir still set when passing control to the users' shell environments. The script should have an unset libdir line tacked on the end of it.

• Also, the /etc/profile.d/kde.{csh,sh} files are packaged with execute permissions. This is unnecessary and inappropriate for sourced shell files. If you look at the other files under /etc/profile.d, you'll see all of them are mode 0644, not an extraneous 0755.