tests: rely on __SNR_xxx instead of __NR_xxx for syscalls

tests: rely on __SNR_xxx instead of __NR_xxx for syscalls

We recently changed how libseccomp handles syscall numbers that are
not defined natively, but we missed test #15.

Signed-off-by: Paul Moore <paul@paul-moore.com>
Note: Tagged for v2.5, but needed to build 2.4.2 with newer kernels on arm
This is part of PR: https://github.com/seccomp/libseccomp/pull/182
Upstream Bug: https://github.com/seccomp/libseccomp/issues/184
Origin: upstream, https://github.com/pcmoore/misc-libseccomp/commit/35803ceb43c453762a3ab5177c5f8d5dbb813478
Bug-Ubuntu: https://bugs.launchpad.net/bugs/1849785
Last-Update: 2019-11-12

Gbp-Pq: Name tests-rely-on-__SNR_xxx-instead-of-__NR_xxx-for-sysc.patch