qca: debug variant problems

[ryandesign (Ryan Carsten Schmidt)]

The qca port's +debug variant includes the obsolete portgroup. If your intention was to indicate that the variant is obsolete, that's not what the obsolete portgroup does. It indicates that a port is obsolete. Please remove the portgroup from the variant (unless the entire qca port is obsolete...).

The variant also instructs the user to "use configure.optflags="-g"". Users should not be instructed to override portfile variables at the command line. This facility is meant to be used by developers debugging a portfile problem, not by users.