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Convert copyright file to UTF-8

Signed-off-by: Mattia Dongili <564ea3fba55f6e029e83434fb6b3f3b9c7ed334e@linux.it>

RsrchBoy/xserver-xorg-input-synaptics,philipn/xserver-xorg-input-synaptics,philipn/xserver-xorg-input-synaptics,RsrchBoy/xserver-xorg-input-synaptics,philipn/xserver-xorg-input-synaptics