[PATCH] configure: set platform variables also when `uname` is unrecognized

[David Bremner]

Tomi Ollila <tomi.ollila at iki.fi> writes:

> Since commit
>
> 124a67e96ecab5495c0f17b6875d53dfd67ff137: configure: add set -u
>
> all variables must be set before their expansion are attempted. These
> 2 variables: "platform" and "linker_resolves_library_dependencies" were
> not given value in the final 'else' branch when platform check failed
> due to unrecognized kernel name (output of `uname`). Now those two are
> given reasonable non-empty values.
> ---

I tested on Debian/kfreebsd-amd64 and this seems to fix the build
failure in 0.23~rc0

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