4.9.1: test failure on big endian architectures

[jamesjer]

On big endian architectures, such as s390x, two tests fail with version 4.9.1:

testing: /builddir/build/BUILD/gap-pkg-orb-4.9.1-build/BUILDROOT/usr/lib64/gap\
/pkg/orb/tst/bugfix.tst
########> Diff in /builddir/build/BUILD/gap-pkg-orb-4.9.1-build/BUILDROOT\
/usr/lib64/gap/pkg/orb/tst/bugfix.tst:32
# Input is:
hf.func(w, hf.data);
# Expected output:
799
# But found:
741
########
########> Diff in /builddir/build/BUILD/gap-pkg-orb-4.9.1-build/BUILDROOT\
/usr/lib64/gap/pkg/orb/tst/bugfix.tst:55
# Input is:
hf.func(w, hf.data);
# Expected output:
573
# But found:
237
########
     100 ms (93 ms GC) and 1.77MB allocated for bugfix.tst

[fingolfin]

Patches welcome but big endian support is not a priority. I am pretty sure nobody is actually using GAP on a big endian system (other than as part of packaging it)