[exim] CVE-2017-16943, CVE-2017-16944

Both issues are fixed now.

    CVE-2017-16943  (RCE)       Exim Bug 2199
        master:             4e6ae6235c68de243b1c2419027472d7659aa2b4
        exim-4_89+fixes:    4090d62a4b25782129cc1643596dc2f6e8f63bde
    Fix done by Jeremy Harris

    CVE-2017-16944  (DoS)       Exim Bug 2201
        master:             178ecb70987f024f0e775d87c2f8b2cf587dd542
        exim-4_89+fixes:    4804c62909a62a3ac12ec4777ebd48c541028965
    Fix done by me.

We'll prepare a 4.89.1 release including these two fixes,
even though 4.90 is quite close.

If you can't update now, you should disable the chunking extension.
    chunking_advertise_hosts = 

Distros are advised to include these commits.

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