add loaders for 32bit ELF

[stsp]

As #17 was implemented, new
loaders must be added. The ones
from go64 are unavailable in 32bit
mode.
See also dosemu2/dosemu2#2899

[stsp]

The ones
from go64 are unavailable in 32bit
mode.

And it doesn't look like
they can be re-implemented,
as those of go64 are parasiting
on comcom64's startup.
Likely with dj32 I should only
aim for indirect loaders, and
consider that done. Which
only means the stub-based
ones.

[stsp]

Needs also the one for DOS fs.