[Bug 1886197] [NEW] FTBFS in b due to libseccomp change

[Dan Streetman]

Public bug reported:

[impact]

systemd FTBFS in b because __NR__sysctl was force-defined by libseccomp
in 2.4.1-0ubuntu0.18.04.2, but that force-defining was (correctly)
reverted in the latest version 2.4.3-1ubuntu3.18.04.2.

On arm64, __NR__sysctl is not defined, so the build now fails, e.g.:
https://launchpadlibrarian.net/486997294/buildlog_ubuntu-bionic-arm64.systemd_237-3ubuntu10.42~202007031245~ubuntu18.04.1_BUILDING.txt.gz

../src/test/test-seccomp.c: In function ‘test_protect_sysctl’:
../src/test/test-seccomp.c:251:5: error: "__NR__sysctl" is not defined, evaluates to 0 [-Werror=undef]
 #if __NR__sysctl > 0
     ^~~~~~~~~~~~

[test case]

build systemd on bionic with latest packages (i.e. with latest
libseccomp2 package)

[regression potential]

this adds a defined() check before comparing the __NR__sysctl value, so
any regression would be limited to the specific function
test_protect_sysctl() which is part of the test framework, thus leading
to a failed build or incorrectly passed/failed test.

[scope]

this is needed only in Bionic.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Also affects: systemd (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1886197

Title:
  FTBFS in b due to libseccomp change

Status in systemd package in Ubuntu:
  New
Status in systemd source package in Bionic:
  New

Bug description:
  [impact]

  systemd FTBFS in b because __NR__sysctl was force-defined by
  libseccomp in 2.4.1-0ubuntu0.18.04.2, but that force-defining was
  (correctly) reverted in the latest version 2.4.3-1ubuntu3.18.04.2.

  On arm64, __NR__sysctl is not defined, so the build now fails, e.g.:
  https://launchpadlibrarian.net/486997294/buildlog_ubuntu-bionic-arm64.systemd_237-3ubuntu10.42~202007031245~ubuntu18.04.1_BUILDING.txt.gz

  ../src/test/test-seccomp.c: In function ‘test_protect_sysctl’:
  ../src/test/test-seccomp.c:251:5: error: "__NR__sysctl" is not defined, evaluates to 0 [-Werror=undef]
   #if __NR__sysctl > 0
       ^~~~~~~~~~~~

  [test case]

  build systemd on bionic with latest packages (i.e. with latest
  libseccomp2 package)

  [regression potential]

  this adds a defined() check before comparing the __NR__sysctl value,
  so any regression would be limited to the specific function
  test_protect_sysctl() which is part of the test framework, thus
  leading to a failed build or incorrectly passed/failed test.

  [scope]

  this is needed only in Bionic.

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