Bug#948909: cp2k: test failure on armhf and i386 with libint2

[Graham Inggs]

Control: severity -1 important

Downgrading severity since the autopkgtests are now passing [1][2] and
no longer blocking migration.


[1] https://ci.debian.net/packages/c/cp2k/testing/armhf/
[2] https://ci.debian.net/packages/c/cp2k/testing/i386/