[MacPorts] #49241: fix llvm-gcc42 to build against clang compilers on darwin15

[MacPorts]

#49241: fix llvm-gcc42 to build against clang compilers on darwin15
-----------------------------------+--------------------------------
 Reporter:  howarth.at.macports@…  |      Owner:  macports-tickets@…
     Type:  defect                 |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.3.4
 Keywords:                         |       Port:  llvm-gcc42
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 The attached Portfile.diff adds the changes required to build against the
 Apple clang 7.0 compiler and older. This include...

 1) Adding a clang-optimization.patch to use #pragma clang optimize
 off/#pragma clang optimize on to avoid optimization bugs in compiling two
 subroutines under Apple Clang 6.0 or later.

 2) Use of reinplace to avoid passing -module and -no-undefined under the
 clang compiler

 3) Removal of the clang compiler blacklist and the section preventing
 builds on El Capitan

 Tested on darwin15.

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Ticket URL: <https://trac.macports.org/ticket/49241>
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