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A patch in oe-core is needed, at this time, to fix builds with
linux-libc-headers from the 4.8 Linux kernel or newer, which is not the case
for most external toolchains. Unfortunately, this patch also breaks the build
of ppp with older linux-libc-headers, so we need to revert it. A note in the
README is added explaining how to disable this for external toolchains with
recent enough kernel libc headers.
Signed-off-by: Christopher Larson <chris_larson@mentor.com>