xdvik: Fix setsid-after-vfork configure test for C99 compatibility

[Sam James]

> On 31 Jan 2023, at 09:37, Florian Weimer <fweimer at redhat.com> wrote:
> 
> Building texlive 20220321 with an instrumented compiler revealed that
> xdvik has a C99 compatibility issue.  This is similar to the issues
> previously reported by Sam/Gentoo and fixed in r64940 and r64953.  I
> don't know why this hasn't shown up in Gentoo testing; I do expect that
> the result of this configure check changes on GNU/Linux with future
> compilers.

Thanks, I've spotted why I didn't catch this too (diffing relaxed & strict
Clang isn't going to notice when you have an implicit function declaration
error in both). I'll make changes to accommodate that.

Appreciate the heads up!

Best,
sam

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