[exim-dev] compatible with c99?

Hello,

I'm referring to https://bugs.exim.org/show_bug.cgi?id=2585
The -std=c99 flag causes the build to fail. Is this expected behaviour?
Or should we build cleanly using this flag too?

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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