fix for build on AIX. Patch from Christophe. r=alexei
fix for build on AIX. Patch from Christophe. r=alexei

ekr/nss-old,ekr/nss-old,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,ekr/nss-old,nmav/nss,nmav/nss,nmav/nss,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss