Mono: Don't use -rdynamic when compiling for WASM

`-rdynamic` was causing the emsdk linker to silently fail to
generate the output `.wasm` file (even though exit code was 0).

modules/mono/build_scripts/mono_configure.py

@@ -262,6 +262,7 @@ def configure(env, env_mono):
             env_mono.Append(CPPDEFINES=["_REENTRANT"])
 
             if mono_static:
+                if not is_javascript:
                     env.Append(LINKFLAGS=["-rdynamic"])
 
                 mono_lib_file = os.path.join(mono_lib_path, "lib" + mono_lib + ".a")