[DynInst_API:] [dyninst/dyninst] ba63a1: Unify meaning of 'cap_32_64' macro

[Tim Haines <noreply@xxxxxxxxxx>]

  Branch: refs/heads/clarify_cap_32_64
  Home:   https://github.com/dyninst/dyninst
  Commit: ba63a11915aeaf5c8ac047bba614b047c530c3b0
      https://github.com/dyninst/dyninst/commit/ba63a11915aeaf5c8ac047bba614b047c530c3b0
  Author: Tim Haines <thaines@xxxxxxxxxxx>
  Date:   2021-11-01 (Mon, 01 Nov 2021)

  Changed paths:
    M cmake/cap_arch_def.cmake
    M dataflowAPI/src/ABI.C
    M dyninstAPI/src/addressSpace.C
    M dyninstAPI/src/inst-x86.C

  Log Message:
  -----------
  Unify meaning of 'cap_32_64' macro

Currently, this is used in several different ways due to the historical
original meaning drifting over the years. It's meaning is now "this host
64-bit platform supports modifying 32-bit binaries". Currently, this is
only x86 and PPC32. Although the latter is going away soon due to
obsolescence.