Merge branch 'remove-nvclock' into 'master'

Remove nvclock

Closes FSDG https://trisquel.info/en/issues/5102

The package was also removed from debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742377

See merge request !10

purge-lucid

@@ -46,6 +46,7 @@ moon
 ndisgtk
 ndiswrapper
 nikto
+nvclock
 nvidia-common
 nvidia-graphics-drivers*
 nvidia-settings*

purge-precise

@@ -54,6 +54,7 @@ moon
 ndisgtk
 ndiswrapper
 nikto
+nvclock
 nvidia-common
 nvidia-graphics-drivers*
 nvidia-settings*

purge-trusty

@@ -61,6 +61,7 @@ moon
 ndisgtk
 ndiswrapper
 nikto
+nvclock
 nvidia-common
 nvidia-graphics-drivers*
 nvidia-nsight