Fixes gcc8 build error:
In file included from ../src/dbinc/mutex_int.h:12,
from ../src/dbinc/mutex.h:15,
from ./db_int.h:1113,
from ../lang/cxx/cxx_channel.cpp:11:
../src/dbinc/atomic.h:179:19: error:
definition of 'int __atomic_compare_exchange(db_atomic_t*, atomic_value_t, atomic_value_t)'
ambiguates built-in declaration
'bool __atomic_compare_exchange(long unsigned int, volatile void*, void*, void*, int, int)'
static inline int __atomic_compare_exchange(
^~~~~~~~~~~~~~~~~~~~~~~~~
Change-Id: I733aeb261576b76cdfd83ef54c33e2919ebfc9bf
Signed-off-by: Bernd Kuhls <bernd.kuhls at t-online.de>