Set CMAKE_NM in CMake toolchain file (#18842)

Author: croes

cmake/Modules/Platform/Emscripten.cmake

@@ -89,6 +89,7 @@ endif()
 # Specify the compilers to use for C and C++
 set(CMAKE_C_COMPILER "${EMSCRIPTEN_ROOT_PATH}/emcc${EMCC_SUFFIX}")
 set(CMAKE_CXX_COMPILER "${EMSCRIPTEN_ROOT_PATH}/em++${EMCC_SUFFIX}")
+set(CMAKE_NM "${EMSCRIPTEN_ROOT_PATH}/emnm${EMCC_SUFFIX}")
 set(CMAKE_AR "${EMSCRIPTEN_ROOT_PATH}/emar${EMCC_SUFFIX}")
 set(CMAKE_RANLIB "${EMSCRIPTEN_ROOT_PATH}/emranlib${EMCC_SUFFIX}")
 set(CMAKE_C_COMPILER_AR "${CMAKE_AR}")