uclibc: update uClibc-ng to 1.0.12

New release contains a security fix for the resolver library parts.
It contains exp10(), so some patches in buildroot might be obsolete,
when the buildroot toolchains are rebuilt.
It also contains a fix for the symbol clashing with bind9.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>