slapos/obs: overwrite openssl location to avoid unneeded shared build

  This patch can be reverted later, if the shared build get fixed for this point

component/slapos/obs.cfg

@@ -69,6 +69,7 @@ post-install =
 
 [openssl]
 prefix = ${buildout:rootdir}/parts/${:_buildout_section_name_}
+location = ${buildout:parts-directory}/${:_buildout_section_name_}
 make-options +=
   INSTALL_PREFIX=${buildout:destdir}