uclibc: add patch fixing build failures related to time structures

uclibc: add patch fixing build failures related to time structures

The latest bump of uClibc-ng 1.0.23 contains a commit touching <fcntl.h>
that causes a large number of build failures related to time
structures. For the moment, let's revert this patch to avoid the build
failures.

Fixes:

  http://autobuild.buildroot.net/results/fcd024f6658890861fd7165e15edc65f77a9d8e7/
  http://autobuild.buildroot.net/results/431135d9f985f3b3f935cc29fe16728b2412dd3a/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>