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

[MacPorts]

#56373: fix lack of optimization in compiling pymol on clang compilers
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 Reporter:  jwhowarth  |      Owner:  (none)
     Type:  update     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:  science    |       Port:  pymol
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 The attached Portfile diff and new clang_opt_fix.diff restores the
 previous -O3 optimization of pymol on darwin by passing -fno-strict-
 aliasing. Upstream stopped passing any optimization flags at all to pymol
 due to a compiler segfault in compiling layer2/RepCylBond.cpp starting
 with OS X 10.9 and later.

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