[master] don't link with -lgtest

remove GTEST_LDADD
as discussed on jabber
the benchmark tool doesn't use googletest

src/bin/resolver/bench/Makefile.am

@@ -19,7 +19,6 @@ resolver_bench_SOURCES += fake_resolution.h fake_resolution.cc
 resolver_bench_SOURCES += dummy_work.h dummy_work.cc
 resolver_bench_SOURCES += naive_resolver.h naive_resolver.cc
 
-resolver_bench_LDADD  = $(GTEST_LDADD)
-resolver_bench_LDADD += $(top_builddir)/src/lib/exceptions/libb10-exceptions.la
+resolver_bench_LDADD = $(top_builddir)/src/lib/exceptions/libb10-exceptions.la
 resolver_bench_LDADD += $(top_builddir)/src/lib/asiolink/libb10-asiolink.la