set fPIC for the shared libs otlp grpc test

Author: dbarker

ci/do_ci.sh

@@ -400,6 +400,7 @@ elif [[ "$1" == "cmake.exporter.otprotocol.shared_libs.with_static_grpc.test" ]]
         -DWITH_OTLP_HTTP=ON \
         -DWITH_OTLP_FILE=ON \
         -DBUILD_SHARED_LIBS=ON \
+        -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
         "${SRC_DIR}"
   grpc_cpp_plugin=`which grpc_cpp_plugin`
   proto_make_file="CMakeFiles/opentelemetry_proto.dir/build.make"