c++11: fix libbdb build against libc++ in c++11 mode

atomic_init clashes with

depends/packages/bdb.mk

@@ -12,7 +12,8 @@ $(package)_config_opts_linux=--with-pic
 endef
 
 define $(package)_preprocess_cmds
-  sed -i.old 's/__atomic_compare_exchange/__atomic_compare_exchange_db/' dbinc/atomic.h
+  sed -i.old 's/__atomic_compare_exchange/__atomic_compare_exchange_db/' dbinc/atomic.h && \
+  sed -i.old 's/atomic_init/atomic_init_db/' dbinc/atomic.h mp/mp_region.c mp/mp_mvcc.c mp/mp_fget.c mutex/mut_method.c mutex/mut_tas.c
 endef
 
 define $(package)_config_cmds