build for i386 broken

I tried to build gprolog for i386 using a debootstrapped Debian release, 
and found that the resulting executables always crashed immediately. 
Remembering that I had previously built it successfully I tried earlier 
git branches, with the same result. I then tried it with earlier 
versions of the c compiler and libraries, by using earlier Debian 
versions. Bullseye and Buster also make bad executables, Stretch gives 
an internal compiler error during build, and Jessie builds and runs OK, 
even the latest git branch.

That's with the default build settings, I guess the next step is to try 
on recent distributions again with lower optimization.

     --Jasper