Bug 1738845 - Add some missing combinations of conditions to GN processing....

Bug 1738845 - Add some missing combinations of conditions to GN processing. r=firefox-build-system-reviewers,andi a=RyanVM

Ideally, the code would handle things in a more general way that doesn't
require manually dealing with these lists, but this would require more
testing than there is time left before 102 releases.

While here, remove HOST_CPU_ARCH, which is always the same and thus
never appears in a condition.

This changes none of the generated moz.builds for the current
configuration (but changes the outcome when adding new configurations)

Differential Revision: https://phabricator.services.mozilla.com/D149850