Revert "Re-land migrate md5sum tool to portable zlib utils"

This reverts commit 00c7f91f09462399fff5e5266eeddcd6e0c9405c.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 774325 as the
culprit for failures in the build cycles as shown on:
https://analysis.chromium.org/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzAwYzdmOTFmMDk0NjIzOTlmZmY1ZTUyNjZlZWRkY2Q2ZTBjOTQwNWMM

Sample Failed Build: https://ci.chromium.org/b/8878570367609188432

Sample Failed Step: compile

Original change's description:
> Re-land migrate md5sum tool to portable zlib utils
> 
> Use the set of portable code from zlib that shouldn't have
> extra dependencies (e.g. 'base').
> 
> Also allow building the tool for other targets (e.g. Linux,
> OSX, etc) as that allows easier testing and profiling.
> 
> Compilation is disabled for Windows, see crbug.com/1090428.
> 
> Bug: 1076580, 1087999
> Change-Id: Ic036685029be99b06753ea18f9fc62ce7c1a6540
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225526


> Reviewed-by: Tao Bai <michaelbai@chromium.org>
> Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#774325}


Change-Id: I90e7158af6e9484a63f523cc75f5bfc52288262b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1076580, 1087999
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2227311
Cr-Original-Commit-Position: refs/heads/master@{#774345}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: dce405365e73a56c29a683990b9eae1f0d46cc9f