Bug#896468: Cacti 1.2 + Chart.js

[Mark Brugnoli-Vinten]

We normally ship Chart.js with the source.  However, due to the packages 
already supplying Chart.js, this is removed for compatibility with the package 
management system.  As such, the version shipped is unusable.  This has come to 
light as a result of drawn out diagnosis of someone’s issue with a plugin for 
Cacti.  Once they removed the Chart.js symlink and inserted a proper 2.x 
version, everything worked fine.