[tlbuild] Test failures for dvipdmfx on OpenBSD

[Mojca Miklavec]

Hi,

There seem to be some further occasional failures on OpenBSD:

./makejvf $srcdir/tests/min10.tfm rml && \
  cmp $srcdir/tests/min10.vf min10.vf && \
  cmp $srcdir/tests/rml.tfm rml.tfm || exit 1
+ ./makejvf ../../../texk/makejvf/tests/min10.tfm rml
Segmentation fault (core dumped)
+ exit 1
FAIL makejvf.test (exit status: 1)

Mojca