Linking IDBFS in CMake project requires -lidbfs.js in compilation flags, but warns anyways

CMakeLists.txt:
```cmake
project(test)
set(CMAKE_EXECUTABLE_SUFFIX .html)
set(CMAKE_C_FLAGS "${CMAKE_CXX_FLAGS} --use-preload-plugins -Weverything")
set(CMAKE_LINKER_FLAGS "${CMAKE_LINKER_FLAGS} -lidbfs.js --use-preload-plugins")
add_executable(test test.c)
```

test.c:
```c
#include
#include

int main()
{
EM_ASM({
FS.mkdir("/tempdata");
FS.mount(IDBFS, {}, "/tempdata");
});

return 0;
}
```

Compiling this project will give a failing runnable, with a message telling me I need to add `-lidbfs.js` in the CLI arguments, although I have already done that for the linker.

If I add the same argument in the compiler flags, the project will compile and run just fine; however, it will warn at compilation time telling me the argument was ignored.

Is it normal I need to include `-lidbfs.js` in the compilation flags? Currently, the project fails to run if I don't, but the compiler warns if I do.