wxwidgets: A more common name for wxmac.
wxwidgets: A more common name for wxmac.

- Change the blacklist to hint that we include wxpython with wxwidgets.

Closes Homebrew/homebrew#15407.

Signed-off-by: Max Howell <6ab8060e002788ba9309d53dba8df070e650cb04@me.com>

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