[tlbuild] Broken tests for mendexk on arm

[Mojca Miklavec]

Hi,

These changes broke mendexk tests or arm (Raspberry PI; armhf-linux &
aarch64-linux):
    http://tug.org/svn/texlive?view=revision&revision=58576

Sorting pages....done(27 comparisons).
Making index file....done.
0 warnings, written in pprecA-0.ilg.
Output written in pprecA-0.ind1.
+ diff ../../../texk/mendexk/tests/pprecA-0.ind pprecA-0.ind1
3c3
<   \item entryA[[delim0]]i[[sfx 3p]], 1[[sfx 3p]], I[[sfx 3p]]
---
>   \item entryA[[delim0]]i, ii, iii, 1, 2, 3, I, II, III
+ exit 1
FAIL tests/mendex.test (exit status: 1)

(I admit that I was fiddling with arm-related changes a bit in the
build configuration during the last two days, but I hope that wasn't
the reason for the failure.)

Mojca