package/libuv: bump to version 1.0.2

libuv has moved to github.com/libuv/libuv

[Thomas: fix Config.in help text, as noticed by Baruch.]

Signed-off-by: Jörg Krause <jkrause@posteo.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>