Fix some issues.

[nasyxx]

• Use distname.dmg instead of distfile since we don't have distfiles defined.
• Move docdir outside post destroot to avoid the "no such variable" error.

[Gcenx]

• Use distname.dmg instead of distfile since we don't have distfiles defined.

macports-base sets this for us already including the extraction suffix.

• Move docdir outside post destroot to avoid the "no such variable" error.

Yep this needs to live outside of pre-destroot

[Gcenx]

That should have been distfiles not distfile my mistake for not verifying it against my local copy.