openvpn: enable options consistency check even in the small build

Only costs about 3k compressed, but significantly improves handling of
configuration mismatch

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 47439

package/network/services/openvpn/patches/200-small_build_enable_occ.patch

+--- a/src/openvpn/syshead.h
++++ b/src/openvpn/syshead.h
+@@ -597,9 +597,7 @@ socket_defined (const socket_descriptor_
+ /*
+  * Should we include OCC (options consistency check) code?
+  */
+-#ifndef ENABLE_SMALL
+ #define ENABLE_OCC
+-#endif
+ 
+ /*
+  * Should we include NTLM proxy functionality