gallium: correctly manage libsensors link flags
We should be using LIBS rather than the LDFLAGS variable. Furthermore try to keep the linking to the final stage, rather than intermetent static library. Cc: Steven Toth <stoth@kernellabs.com> Signed-off-by:Emil Velikov <emil.velikov@collabora.com> Reviewed-by:
Nicolai Hähnle <nicolai.haehnle@amd.com>