[MacPorts] #41167: Add a +nowarnings variant to work around issues with the new compiler

[MacPorts]

#41167: Add a +nowarnings variant to work around issues with the new compiler
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 Reporter:  nomis52@…            |      Owner:  macports-tickets@…
     Type:  enhancement          |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.2.1
 Keywords:  haspatch maintainer  |       Port:  ola
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 The new compiler that comes with XCode 5 is failing with :

 #warning Use of the header <ext/hash_map> is deprecated.

 This variant disables fatal warnings  (-Werror) so users can continue to
 build until the next release with the fixes is out.

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Ticket URL: <https://trac.macports.org/ticket/41167>
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