HPCC-31301 Remove macros from platform.h that can cause 3rd party compile problems

[ghalliday]

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[github-actions]

https://track.hpccsystems.com/browse/HPCC-31301
Jira updated

[ghalliday]

This only removes the macros that were causing problems with arrow. We would probably benefit from cleaning this file up - it probably hasn't changed in 20 years....

[jakesmith]

I assume "BOOL" guaranteed to defined by a standard include file?

[ghalliday]

I think it is only used in windows specific code in the platform. It is from the days before bool was part of the c/c++ standard...
However I will re-target to master since no need for this change to go in 9.4.x

[jakesmith]

@ghalliday - looks fine, 1 quesiton