Bug#1054712: ensmallen: FTBFS: adam_test.cpp:17:10: fatal error: catch2/catch.hpp: No such file or directory

[Drew Parsons]

Source: ensmallen
Followup-For: Bug #1054712

Should be noted that the problem is linked to debian patch
0002-use-system-catch.patch, which disables upstream's local copy of
catch in order to use the system catch2 library.

So one workaround could be to disable 0002-use-system-catch.patch.