Fix filetag for "C" file extension.

Such files should be considered C++, not C.

Change-Id: Ifc9608eb5196b250694f0dec2a769a1f65c11a79
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Add missing description for "ln" commands.

These missing descriptions are the cause for weird empty lines appearing
in Qt Creator's compile output.

Change-Id: I67af9adf816496595d5fd3d8bdb372e06aa7c8b1
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>