[MacPorts] #56373: fix lack of optimization in compiling pymol on clang compilers

[MacPorts]

#56373: fix lack of optimization in compiling pymol on clang compilers
------------------------+---------------------
  Reporter:  jwhowarth  |      Owner:  (none)
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  science
      Port:  pymol      |
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Comment (by jwhowarth):

 Tested on 10.13 with Xcode 9.3. Without the use of -fno-strict-aliasing, a
 build with -O3 produces the compiler segfault...

 {{{
 fatal error: error in backend: Unsupported expression in static
 initializer: fsub (float 1.000000e+00, float undef)
 clang: error: clang frontend command failed with exit code 70 (use -v to
 see invocation)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56373#comment:1>
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