stand: Add support for 64-bit machines with 32-bit UEFI implementations

Some machines have 64-bit capable cpus but are stuck on 32-bit uefi
firmware.

Add support for them by building a new "loader_

stand: Add support for 64-bit machines with 32-bit UEFI implementations

Some machines have 64-bit capable cpus but are stuck on 32-bit uefi
firmware.

Add support for them by building a new "loader_ia32" with
LOADER_DEFAULT_INTERP along with the 64-bit one. The loader
can be disabled using MK_LOADER_IA32.

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1098

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