Fix envoy build

mocktracer/BUILD

@@ -7,11 +7,13 @@ cc_library(
     deps = [
         "//:opentracing",
     ],
+    alwayslink = 1,
 )
 
 cc_binary(
     name = "libmocktracer_plugin.so",
     linkshared = 1,
+    linkstatic = 1,
     visibility = ["//visibility:public"],
     deps = [
         "//mocktracer:mocktracer"

src/dynamic_load_unix.cpp

@@ -35,7 +35,13 @@ DynamicallyLoadTracingLibrary(const char* shared_library,
                               std::string& error_message) noexcept try {
   dlerror();  // Clear any existing error.
 
-  const auto handle = dlopen(shared_library, RTLD_NOW | RTLD_LOCAL);
+  const auto handle = dlopen(shared_library, RTLD_NOW | RTLD_LOCAL
+#if defined(__has_feature)
+#if __has_feature(address_sanitizer)
+      | RTLD_NODELETE
+#endif
+#endif
+  );
   if (handle == nullptr) {
     error_message = dlerror();
     return make_unexpected(dynamic_load_failure_error);