[MacPorts] #56572: fbthrift: update to 2018.05.28.00

[MacPorts]

#56572: fbthrift: update to 2018.05.28.00
-------------------------+------------------------
  Reporter:  mohd-akram  |      Owner:  ryandesign
      Type:  update      |     Status:  accepted
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  fbthrift    |
-------------------------+------------------------

Comment (by mohd-akram):

 Found the culprit.

 In `./work/build/CMakeFiles/CMakeError.log`:

 {{{
 Building C object CMakeFiles/cmTC_513c0.dir/CheckSymbolExists.c.o
 /usr/bin/clang  -I/opt/local/include  -pipe -Os -DNDEBUG
 -I/opt/local/include -std=gnu++14 -arch x86_64 -mmacosx-version-min=10.13
 -o CMakeFiles/cmTC_513c0.dir/CheckSymbolExists.c.o   -c
 /opt/local/var/macports/build/_Users_mohamed_.ports_devel_folly/folly/work/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
 error: invalid argument '-std=gnu++14' not allowed with 'C'
 make[1]: *** [CMakeFiles/cmTC_513c0.dir/CheckSymbolExists.c.o] Error 1
 make: *** [cmTC_513c0/fast] Error 2

 File
 /opt/local/var/macports/build/_Users_mohamed_.ports_devel_folly/folly/work/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
 /* */
 #include <pthread.h>

 int main(int argc, char** argv)
 {
   (void)argv;
 #ifndef pthread_atfork
   return ((int*)(&pthread_atfork))[argc];
 #else
   (void)argc;
   return 0;
 #endif
 }
 }}}

 `clang` gives an error when passing an invalid `-std` argument, causing
 `cmake` checks to fail, while GCC (tested with `gcc-mp-5`) treats it as a
 warning.

 The `std=gnu++14` argument is added
 [https://github.com/facebook/folly/commit/c8d7b1383b3315a6bb7f7882c4a116fe990dee71
 here].

 I've attached a patch for this that removes that flag for C-based checks.

-- 
Ticket URL: <https://trac.macports.org/ticket/56572#comment:2>
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