get_ipc_path: Validate file paths, in case of broken symlinks

[flibitijibibo]

Fixes #201
Ref randovania/randovania#4138

[TheSpookyCat]

Can merge once tested

[flibitijibibo]

Standalone test:

test.py:

import os
import sys

full_path = os.path.abspath(".")
if sys.platform == 'win32' or os.path.isdir(full_path):
    for entry in os.scandir(full_path):
        if entry.name.startswith("discord-ipc"): # and os.path.exists(entry):
            print(entry.path)

test.sh:

cd "`dirname "$0"`"
mkdir -p app/com.discordapp.Discord
touch app/com.discordapp.Discord/discord-ipc-3
for i in {0..9}; do
    test -S ./discord-ipc-$i || ln -sf {app/com.discordapp.Discord,.}/discord-ipc-$i;
done
python test.py

Before:

/home/flibitijibibo/Programming/pypresencetest/discord-ipc-4
/home/flibitijibibo/Programming/pypresencetest/discord-ipc-5
/home/flibitijibibo/Programming/pypresencetest/discord-ipc-3
/home/flibitijibibo/Programming/pypresencetest/discord-ipc-1
/home/flibitijibibo/Programming/pypresencetest/discord-ipc-9
/home/flibitijibibo/Programming/pypresencetest/discord-ipc-0
/home/flibitijibibo/Programming/pypresencetest/discord-ipc-6
/home/flibitijibibo/Programming/pypresencetest/discord-ipc-7
/home/flibitijibibo/Programming/pypresencetest/discord-ipc-2
/home/flibitijibibo/Programming/pypresencetest/discord-ipc-8

After:

/home/flibitijibibo/Programming/pypresencetest/discord-ipc-3

[flibitijibibo]

Looks like one of the dependencies has a CVE? Can't see a capped version in the repo so I guess this is GitHub's problem for the moment 😅

[TheSpookyCat]

Thanks!
oops wrong button
Looking into the CVE now