digikam 6.2.0 64-bit appimage error

[John Dickson]

Received this error when starting the new 6.2.0 appimage on Mint 18.1:

$ ./digikam-6.2.0-x86-64.appimage
-- digiKam Linux AppImage Bundle
-- Use 'help' as CLI argument to know all available options for digiKam
application.
-- Note: to integrate this bundle to your desktop, use AppImageLauncher.
libudev.so.0
-- Preloading shared libs:
digikam: /lib/x86_64-linux-gnu/libz.so.1: version `ZLIB_1.2.9' not found
(required by /tmp/.mount_digikabetcHs/usr/lib/libpng16.so.16)

$ cat /etc/lsb-release
DISTRIB_ID=LinuxMint
DISTRIB_RELEASE=18.1
DISTRIB_CODENAME=serena
DISTRIB_DESCRIPTION="Linux Mint 18.1 Serena"
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