[MacPorts] #53896: upgrade libsndfile to 1.0.27

[MacPorts]

#53896: upgrade libsndfile to 1.0.27
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 Reporter:  janstary             |      Owner:
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.4.99
 Keywords:  haspatch maintainer  |       Port:  libsndfile
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 The attached diff to the Portfile

 * upgrades audio/libsndfile to 1.0.27
 * combines all the directives for no_external_libs into one block
 * explicitly --disable-test-coverage as we are not using it anyway
 * drops the carbon patch - no longer needed, upstream removed Carbon
 * drops the speex patch - speex has been obsoleted years ago
 * drops the 8-year-old config.h patch

 Tested on 10.6.8/i386 running 2.4.99, please test everywhere else.
 I have other plans for libsndfile, but let's start with the latest
 release.

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Ticket URL: <https://trac.macports.org/ticket/53896>
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