Libretro buildbot failures

[LibretroAdmin]

Hi there,

I think this was the last time all the Libretro targets still built succesfully -

https://git.libretro.com/libretro/wasm4/-/pipelines/302211

Something happened after merging this PR that caused a bunch of failures since -

https://git.libretro.com/libretro/wasm4/-/pipelines/302363

[yamt]

is it using an ancient cmake (<3.13) for some reasons?
cf. https://cmake.org/cmake/help/latest/command/target_link_directories.html

[yamt]

is it using an ancient cmake (<3.13) for some reasons? cf. https://cmake.org/cmake/help/latest/command/target_link_directories.html

0795bd9#commitcomment-147685154

[yamt]

a proposed fix: #769