libfabric: don't LIBADD the common library in the static case

Adding the libfabric common library in the --disable-dlopen case will
result in duplicate symbols.

ompi/mca/mtl/ofi/Makefile.am

@@ -50,5 +50,4 @@ mca_mtl_ofi_la_LDFLAGS = -module -avoid-version
 
 noinst_LTLIBRARIES = $(component_noinst)
 libmca_mtl_ofi_la_SOURCES = $(mtl_ofi_sources)
-libmca_mtl_ofi_la_LIBADD = $(opal_common_libfabric_LIBADD)
 libmca_mtl_ofi_la_LDFLAGS = -module -avoid-version

opal/mca/btl/usnic/Makefile.am

@@ -94,7 +94,6 @@ mca_btl_usnic_la_LIBADD = $(opal_common_libfabric_LIBADD)
 noinst_LTLIBRARIES = $(lib)
 libmca_btl_usnic_la_SOURCES = $(lib_sources)
 libmca_btl_usnic_la_LDFLAGS= -module -avoid-version $(btl_usnic_LDFLAGS)
-libmca_btl_usnic_la_LIBADD = $(opal_common_libfabric_LIBADD)
 
 if OPAL_BTL_USNIC_BUILD_UNIT_TESTS
 usnic_btl_run_tests_CPPFLAGS = \