Initialize the library on the specified socket instead of stdin

[Louson]

Initialization of the library could not be done without creating a
request on the standard input.

This can be a problem if the program has disabled the standard input
(a linux daemon for example).

Then this commit enables to initialize the library on a specified
socket without using the standard input.

EDIT: I miss knowledge about windows, then :

• this has only be tested on Linux, I am not sure about what I did in the build files
• this does not include the standard way to close the IPC on windows