[MKISOFS]

[MKISOFS]
Update mkisofs to schily-2016-12-14 giving us the following features:
- Support for -duplicates-once to store duplicate files in the tree only once in the filesystem (see also CORE-9266)
  I've enabled this for the hybridcd target where it actually saves us 25 MB.
- Proper System-ID "Win32/MinGW" and "Win32/MSVC" under Windows hosts depending on the compiler

CORE-12578

svn path=/trunk/; revision=73520