libdb: fix atomic comparison conflicting with gcc builtins

Just applying the patch from here:
https://git.archlinux.org/svntogit/packages.git/plain/trunk/atomic.patch?h=packages/db

component/libdb/buildout.cfg

@@ -10,9 +10,14 @@ shared = true
 #md5sum = 33491b4756cb44b91c3318b727e71023
 url = http://anduin.linuxfromscratch.org/BLFS/bdb/db-5.3.28.tar.gz
 md5sum = b99454564d5b4479750567031d66fe24
+patches =
+  ${:_profile_base_location_}/atomic.patch#007492e22d272871902afaf1f6765d6e
+patch-options = -p0
 configure-command = cd build_unix && ../dist/configure
 configure-options =
   --disable-static
   --prefix=@@LOCATION@@
   --enable-cxx
 make-binary = cd build_unix && make
+environment =
+  PATH=${patch:location}/bin:${pkgconfig:location}/bin:%(PATH)s