libfabric: disable all semblance of verbs

Including the usnic fake ibv verbs driver.

This fix was mistakenly not included in open-mpi/ompi@d0937c6.

opal/mca/common/libfabric/Makefile.am

@@ -45,6 +45,7 @@ cppflags = \
 	-DRDMADIR=\"/tmp\" \
 	-DEXTDIR=\"$(pkglibdir)\" \
 	-DENABLE_DEBUG=0 \
+        -DHAVE_VERBS=0 \
 	'-DVERSION="embedded libfabric de8444c9771ab9022d952a27134e44e5d8a5d722"' \
 	'-DPACKAGE="embedded libfabric de8444c9771ab9022d952a27134e44e5d8a5d722"'
 libadd = $(opal_common_libfabric_embedded_LIBADD)
@@ -86,7 +87,6 @@ libfabric_usnic_headers = \
 	libfabric/prov/usnic/src/usdf_cq.h \
 	libfabric/prov/usnic/src/usdf_dgram.h \
 	libfabric/prov/usnic/src/usdf_endpoint.h \
-	libfabric/prov/usnic/src/usdf_fake_ibv.c \
 	libfabric/prov/usnic/src/usdf_msg.h \
 	libfabric/prov/usnic/src/usdf_progress.h \
 	libfabric/prov/usnic/src/usdf_rdm.h \