OS/2 uses prldap50 instead of ldappr50. yay consistency

configure.in

@@ -4602,7 +4602,7 @@ if test "$MOZ_LDAP_XPCOM"; then
             LDAP_LIBS='$(DIST)/lib/$(LIB_PREFIX)nsldap32v50.${LIB_SUFFIX} $(DIST)/lib/$(LIB_PREFIX)/nsldappr32v50.${LIB_SUFFIX}'
         fi
     elif test "$VACPP"; then
-            LDAP_LIBS='$(DIST)/lib/$(LIB_PREFIX)ldap50.${LIB_SUFFIX} $(DIST)/lib/$(LIB_PREFIX)/ldappr50.${LIB_SUFFIX}'
+            LDAP_LIBS='$(DIST)/lib/$(LIB_PREFIX)ldap50.${LIB_SUFFIX} $(DIST)/lib/$(LIB_PREFIX)/prldap50.${LIB_SUFFIX}'
     else
         LDAP_LIBS='-L${DIST}/bin -L${DIST}/lib -lldap50 -llber50 -lprldap50'
     fi