This was the reason why game capture could not hook when the hook was
run at administrator level and the game/target was below administrator
level: it was because the plugin created a pipe, and the hook tried to
connect to that pipe, but because the pipe was created as administrator
with default access rights, the pipe did not allow write access for
anything below administrator level, therefor the hook could not connect
to the plugin, and the hook would always fail as a result.
This fixes the issue by creating the pipe with full access rights to
everyone instead of default access rights.
Originally I made the "win_pipe" stuff for named pipes on windows but it
was argued that it should be available to all modules and
programs/libraries that the modules might communicate with.
It cannot really be put in to libobs due to the fact that there would
hypothetically be things unrelated to libobs that might want to use it,
so I felt the best option was just to create a simple static library
specific for interprocess communication.
Non-windows versions of these functions are still yet to be implemented.
