Don't emit a warning when building multiple flavors of the same group. (RMK-886) Also, alter the warning to note that the feature is deprecated.
Don't emit a warning when building multiple flavors of the same group. (RMK-886)
Also, alter the warning to note that the feature is deprecated.

sassoftware/rmake3,sassoftware/rmake3,sassoftware/rmake,sassoftware/rmake3,sassoftware/rmake,sassoftware/rmake