googletest: avoid installing any pieces of it

This makes rpmbuild happy.

Signed-off-by: Josh Durgin <jdurgin@redhat.com>

diff --git a/src/googletest b/src/googletest
index 7f8609b0c2670e82fc0372b1610b33efd6be2070..fdb850479284e2aae047b87df6beae84236d0135 160000 (submodule)
--- a/src/googletest
+++ b/src/googletest
@@ -1 +1 @@
-Subproject commit 7f8609b0c2670e82fc0372b1610b33efd6be2070
+Subproject commit fdb850479284e2aae047b87df6beae84236d0135