[MacPorts] #71522: bind9 @9.20.4 did not build with system compiler on macOS 10.11.6

[MacPorts]

#71522: bind9 @9.20.4 did not build with system compiler on macOS 10.11.6
------------------------+------------------------
  Reporter:  snowflake  |      Owner:  danielluke
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.10.99
Resolution:  fixed      |   Keywords:
      Port:  bind9      |
------------------------+------------------------

Comment (by snowflake):

 I get the same error as the build bots for 10.11

 https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/283129/steps
 /install-port/logs/stdio

 If's something to do with atomics,  as you surmised
 {{{
 histo.c:250:9: error: address argument to atomic operation must be a
 pointer to non-const _Atomic type ('const hg_chunk_t *' (aka 'const
 _Atomic(hg_bucket_t *) *') invalid)
         return atomic_load_acquire(&hg->chunk[chunk]);
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 ./include/isc/atomic.h:50:32: note: expanded from macro
 'atomic_load_acquire'
 #define atomic_load_acquire(o) atomic_load_explicit((o),
 memory_order_acquire)
                                ^                    ~~~
 /Library/Developer/CommandLineTools/usr/bin/../lib/clang/8.0.0/include/stdatomic.h:135:30:
 note: expanded from macro 'atomic_load_explicit'
 #define atomic_load_explicit __c11_atomic_load
                              ^
 histo.c:265:26: error: address argument to atomic operation must be a
 pointer to non-const _Atomic type ('const hg_bucket_t *' (aka 'const
 _Atomic(uint_fast64_t) *') invalid)
         return bp == NULL ? 0 : atomic_load_relaxed(bp);
                                 ^~~~~~~~~~~~~~~~~~~~~~~
 ./include/isc/atomic.h:28:32: note: expanded from macro
 'atomic_load_relaxed'
 #define atomic_load_relaxed(o) atomic_load_explicit((o),
 memory_order_relaxed)
                                ^                    ~~~
 /Library/Developer/CommandLineTools/usr/bin/../lib/clang/8.0.0/include/stdatomic.h:135:30:
 note: expanded from macro 'atomic_load_explicit'
 #define atomic_load_explicit __c11_atomic_load
                              ^
 }}}

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Ticket URL: <https://trac.macports.org/ticket/71522#comment:4>
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