inkscape should not have variants enable_debugging and disable_debugging

[ryandesign (Ryan Carsten Schmidt)]

inkscape should not have variants called "enable_debugging" and "disable_debugging". It should have only a single variant called "debugging", or even better, "debug", to match what some other ports use.

Also, the way the default_variants are specified in the port currently does not work, because the "+" at the beginning of the variant name in that directive was forgotten. (The portfile says "default_variants disable_debugging" but it would have to say "default_variants +disable_debugging" to actually do anything.) But once the dueling variants are changed to a single one that is not default, this becomes a moot point.

[dbevans (David B. Evans)]

Just removed them both as the disk space saved is not really significant these days. A hold over from before my time. See r83782.