Retroarch silently fails when cache directory doesen't exists

[amlib]

When cache_directory is set without an existing directory, retroarch silently fails when loading a rom file inside an archive. It tries to warn the user about not being able to extract the archive, but fails to tell why:

RetroArch [ERROR] :: Failed to extract content from compressed file: /home/user/some/dir/some_rom.zip.

When cache_directory is invalid it should either behave the same way as when it's empty, try to create the directory or check if the directory exits/is accessible and warn the user accordingly.

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[nfp0]

In my observation, on RetroArch 1.7.5 when I try to open a ROM when cache_directory is not set, the game loads normally, but I don't know where the extracted ROM goes to, with the exception of the Genesis Plus GX core, in which case the ROM gets extracted to the RetroArch root directory. In all other cases I tested (Mesen, Higan, Parallel N64, Gambatte, and mGBA) I don't know where the ROM is extracted to.