[MacPorts] #63601: libxslt @1.1.34_6: add a variant for better performance

[MacPorts]

#63601: libxslt @1.1.34_6: add a variant for better performance
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  Reporter:  cooljeanius  |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.1
Resolution:               |   Keywords:
      Port:  libxslt      |
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Comment (by szhorvat):

 I benchmarked my own use case after adding `-O3 -flto=thin`. The timing
 went from 104 to 96 seconds. That's a 7-8% improvement, not small, but
 also not huge for my own usecase.

 The above suggestion includes many additional optimization options that
 are unsafe, and I would not be comfortable using. I did not include the
 patch.

 I tried this with the default compiler on macOS 10.14.6.

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Ticket URL: <https://trac.macports.org/ticket/63601#comment:2>
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