package/binutils-2.25.1: backport upstream patch for PR19405

Fixes Buildroot generated toolchains:
http://autobuild.buildroot.net/results/89b/89b46f97e2736d9337f888c761259e7bc7cdd128

Upstream bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=19405



Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>