Check whether portable is directory to avoid conflict with portable sandboxing framework

[heavysink]

Portable sandboxing framework adds an executable called "portable" which may confuse the portable configuration check of cemu. Fix #1444

[capitalistspz]

Given the issue you raised, a more resilient solution would be to add a build flag, so that package makers can disable portable mode. Otherwise the next problem might be that there's a package that creates a portable directory for some other purpose

[goeiecool9999]

a more resilient solution would be to add a build flag

Which cemu used to have. 9bbb7c8 deliberately removed the build flag and let Cemu determine if it should run portably at runtime. I personally prefer this. Maybe a reasonable compromise would be to add an overriding command line argument?

[capitalistspz]

Determining whether to run portably at runtime can still be done, the flag can be used to prevent Cemu from being allowed to decide at runtime.

There's a problem with using a command line argument, being that you'd have to set it every time you ran Cemu from the command line

[goeiecool9999]

Determining whether to run portably at runtime can still be done, the flag can be used to prevent Cemu from being allowed to decide at runtime.

Sounds good to me. I figured that's probably what you meant after I already posted my reply.

[Exzap]

Superseded by #1464