Bug#957858: syslinux GCC-10 patch

[Lukas Schwaighofer <lukas@schwaighofer.name>]

I was kindly pointed to
  https://bugzilla.suse.com/show_bug.cgi?id=1166605#c5
privately (thanks!), which explains that __builtin_strlen is not
actually a "builtin" and relying on that without providing a strlen
implementation is not correct (and in fact broken with GCC-10).

I'm updating the patch's description accordingly and will upload this
to unstable.

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