Build libuhd_test as static to avoid visibility issues
--- uhd-3.15.0.0/host/tests/common/CMakeLists.txt.orig	2020-01-01 05:21:49.000000000 +0100
+++ uhd-3.15.0.0/host/tests/common/CMakeLists.txt	2020-07-10 20:09:57.071597860 +0200
@@ -8,7 +8,8 @@
 # Build uhd_test static lib
 ########################################################################
 include_directories("${CMAKE_SOURCE_DIR}/lib/include")
-add_library(uhd_test ${CMAKE_CURRENT_SOURCE_DIR}/mock_ctrl_iface_impl.cpp
+add_library(uhd_test STATIC
+                     ${CMAKE_CURRENT_SOURCE_DIR}/mock_ctrl_iface_impl.cpp
                      ${CMAKE_CURRENT_SOURCE_DIR}/mock_zero_copy.cpp
                      ${CMAKE_SOURCE_DIR}/lib/rfnoc/graph_impl.cpp
                      ${CMAKE_SOURCE_DIR}/lib/rfnoc/async_msg_handler.cpp