Third temp hunterised v1.84.1

Further release since previous did not fix issue. Now disable builds of leftwin.h unless enabled.

v1.84.1-jf2: Ensure microsoft extensions are added for VS builds

Further updated hunterised v1.81.1 build

Temp Updated 1.84.1

Change C++ comments to C

Hunterised v1.84.1

v1.84.1 from official site with hunterisation changes from v1.83.1

Hunterised v1.83.1

v1.83.1 from DanBoomberg/leptonica with cherry-pick of modified hunterisation commits from 1.74.2.
Lots of manual changes as that is 6 year old branch. Also try and follow more modular/target-orientated
approach than previously and in DanBloomberg.

Fixing iOS build

Merge pull request #1 from john-forrest/hunter

Fix for iOS builds

Fixing JPEG library

v1.74.2-p4-patched

Rename JPEG library name in hunter add package