Remove uClibc build fix; current uClibc version defines the required
macro.
Remove static link fix; fixed upstream.
Rebase the musl libc-compat.h workaround to adapt to upstream headers
location change.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>