buildroot

squid: uClibc workaround no longer required

As all librt and libpthread functions are integrated into
libc for a while, workaround no longer required.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>