libwebp DLLs aren't detected by CMake's `$<TARGET_RUNTIME_DLLS:...>` with FetchContent

[sam20908]

When I link my project with SDL3_image and copy the DLLs using CMake's example code at https://cmake.org/cmake/help/latest/manual/cmake-generator-expressions.7.html#genex:TARGET_RUNTIME_DLLS, only SDL3_image.dll is copied.

webp is enabled BTW.

Tested on latest commit from here as of this time's writing

[madebr]

By default, SDL_Image and SDL_mixer load the 3rd party libraries using win32's LoadLibrary.
So CMake is not aware of the dependency.
Configure CMake with -DSDL3IMAGE_DEPS_SHARED=OFF --fresh to link against these libraries instead.

[sam20908]

I see.