uclibc: add fix for ARM specific static linking issues

Fixes:
  http://autobuild.buildroot.net/results/fb14e37aaf453874d1c33e5ed73b9c751ace5ae3
  http://autobuild.buildroot.net/results/774a8dd489760bc213ac7cf3e8040cee6a4e2437



And hopefully all other static ARM issues with uClibc-ng.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>