Suggestion for portlint to check the PORTNAME against its directory

[Paco Pascal]

I am writing a port for gf2. The developer of gf2 is inconsistent with the 
name, switching between "gf" and "gf2". Because of this, I wasn't sure what to 
name the port and almost sent a patch with the wrong PORTNAME. It might be 
handy to have portlint spit out a warning to catch when the PORTNAME doesn't 
match its path. For example,

    $ cd devel/gf2
    $ portlint -a -A -m -N -c -C
    looks fine.
    $ grep PORTNAME Makefile
    PORTNAME=       foobar

// Paco

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