ofed: don't expose symbols twice

ibv_init_wq and ibv_cleanup_wq are made visible with the
default_symver which puts them in the IBVERBS_1.1 ABI.  Don't
try to expose them as IBVERBS_PRIVATE_14 symbols as GNU ld
complains with --no-undefined-symbol.

Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D45090

contrib/ofed/libibverbs/libibverbs.map

@@ -137,6 +137,4 @@ IBVERBS_PRIVATE_14 {
 		verbs_register_driver;
 		verbs_init_cq;
 		verbs_cleanup_cq;
-		ibv_init_wq;
-		ibv_cleanup_wq;
 };