Add check for WSL to install.sh

[darcyabjones]

It's kind of hard to see what version of wsl people are using.
It seems like wsl2 works ok, but wsl1 won't run some of the 32bit dependencies.

there are a few options for how to tell which version it is, but I can't confirm that they will always work.

the environment variable WSL_INTEROP should only be set for wsl2
uname -r will show *-microsoft-standard* for wsl2 but wsl1 will have *-Microsoft *

There may be a directory called /run/WSL in wsl2 but in wsl1 it might be /run/WSL1.

AFAIK this is the best I can do, and i've only looked at it for ubuntu.

We should try to warn people using WSL1 this this is the reason they might get an issue with phobius/signalp3.