[jitsi-dev] Addition to developer documentation



The developer documentation describes how to set up the PATH environment
variable for your native libraries. This description is only valid for
Windows, since Linux uses a different environment variable.

Could you please add a bit of text that says that linux users should use
'LD_LIBRARY_PATH' instead?

Personally, I didn't know this and so I tried another setting for a
while which isn't completely without side effects I think.