path_mkdir not working on wii u with trailing slash

While there is this workaround : https://github.com/libretro/libretro-common/blob/44c1cd8bd84b26934d00ce2841e9ed5987029e97/file/file_path_io.c#L199-L211

It still doesn't seem `path_mkdir` works properly on wii u when there is a trailing slash (the workaround makes sense so i'm not sure what's the issue and i don't have the means to debug this myself, all i can do is to try fixing this by removing the trailing slash in https://github.com/libretro/FBNeo/commit/5b472aa42ace69c5250b3d8a9ff518f78fa1a64a then https://github.com/libretro/FBNeo/commit/eeaabd16bdc2df08e05fa8d0df29f911c8e7f92e)

	#if defined(GEKKO)
	{
	size_t len = strlen(basedir);

	/* path_parent_dir() keeps the trailing slash.
	* On Wii, mkdir() fails if the path has a
	* trailing slash...
	* We must therefore remove it. */
	if (len > 0)
	if (basedir[len - 1] == '/')
	basedir[len - 1] = '\0';
	}
	#endif

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path_mkdir not working on wii u with trailing slash #161

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path_mkdir not working on wii u with trailing slash #161

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