It's never reasonable to run a patch on everything in the repository. So this commit ensures that you can only run patch when a specific package is set.
arvindiyengar: ~/Rancher/charts/src/github.com/rancher/charts
$ make patch
FATA[0000] No PACKAGE is set. Run export PACKAGE=<package> before running this command.
make: *** [patch] Error 1
It's never reasonable to run a patch on everything in the repository. So this commit ensures that you can only run patch when a specific package is set.