__sync builtins on macppc

[Valery Ushakov <uwe%stderr.spb.ru@localhost>]

I cannot build recent www/apache24 on macppcc 8.1-STABLE b/c 

/bin/sh /export/netbsd/cvs/pkgsrc-quarterly/www/apache24/work.powerpc/httpd-2.4.39/build/libtool --silent --mode=link gcc  -pthread  -pipe -O2 -D_FORTIFY_SOURCE=2 -I/usr/pkg/include/apr-1 -I/usr/pkg/include -I/usr/include -L/usr/pkg/lib -Wl,-R/usr/pkg/lib -L/usr/lib -Wl,-R/usr/lib -o htpasswd  htpasswd.lo passwd_common.lo /usr/pkg/lib/libaprutil-1.la -lexpat /usr/pkg/lib/libapr-1.la -lrt -lcrypt -lpthread -lcrypt
/export/netbsd/cvs/pkgsrc-quarterly/www/apache24/work.powerpc/.buildlink/lib/libapr-1.so: undefined reference to `__sync_fetch_and_add_8'
/export/netbsd/cvs/pkgsrc-quarterly/www/apache24/work.powerpc/.buildlink/lib/libapr-1.so: undefined reference to `__sync_val_compare_and_swap_8'
/export/netbsd/cvs/pkgsrc-quarterly/www/apache24/work.powerpc/.buildlink/lib/libapr-1.so: undefined reference to `__sync_lock_test_and_set_8'
/export/netbsd/cvs/pkgsrc-quarterly/www/apache24/work.powerpc/.buildlink/lib/libapr-1.so: undefined reference to `__sync_fetch_and_sub_8'
/export/netbsd/cvs/pkgsrc-quarterly/www/apache24/work.powerpc/.buildlink/lib/libapr-1.so: undefined reference to `__sync_sub_and_fetch_8'
*** Error code 1

gcc manual says about __sync builtins:

   Not all operations are supported by all target processors.  If a
  particular operation cannot be implemented on the target processor, a
  warning is generated and a call to an external function is generated.
  The external function carries the same name as the built-in version,
  with an additional suffix `_N' where N is the size of the data type.

so these must come from somewhere and from a (very) quick look it
looks like they should be in libgcc (libgcc/sync.c), but they are not
in the one we build.

-uwe