Log Message:
advancecomp: Update to 2.1

ADVANCECOMP VERSION 2.1 2018/02
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* Support ZIPs with data descriptor signature.
* Fixed a crash condition with invalid ZIP data.

ADVANCECOMP VERSION 2.0 2017/06
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* Added support for reading MNG files with depth of 1, 2, and 4 bits.
* Added 64 bits binary for Windows.
* Updated to libdeflate 29-May-2017.
  From https://github.com/ebiggers/libdeflate
  at commit 1726e9e87fb6f98682dfdea2356d5ee58881fe7b.