Build failure on Travis

[wmayer]

For several days we again have build failures on Travis. So far only the Windows version is affected while Linux versions still succeed.

Test failure occurs in the FEM unit tests:

======================================================================
FAIL: test_1_static_analysis (femtest.testccxtools.TestCcxTools)
----------------------------------------------------------------------
Traceback (most recent call last):
File "C:\Users\travis\build\FreeCAD\FreeCAD\build\Mod\Fem\femtest\testccxtools
.py", line 268, in test_1_static_analysis
"Invalid results read from .frd file"
AssertionError: True is not false : Invalid results read from .frd file
----------------------------------------------------------------------

ping

[Kunda1]

Dupe of https://forum.freecadweb.org/viewtopic.php?f=4&t=37544

[mlampert]

Interestingly I also get them on Linux - I presume there's a new dependency I would need to install?