lib: Remove include of deprecated sysctl.h

[mjstapp]

Test PR to see what happens if we stop including a deprecated header file - deprecated in linux as of the 5.3 kernel it seems, in ubuntu19.10.

[LabN-CI]

🛑 Basic BGPD CI results: FAILURE

Results table

_	_
Result	FAILURE git merge/5212 10d0926 frr.github Build
Date	10/23/2019
Start	04:46:48
Finish	04:47:39
Run-Time	00:51
Total
Pass
Fail
Valgrind-Errors
Valgrind-Loss
Details	vncregress-2019-10-23-04:46:48.txt
Log	make-2019-10-23-04:46:48.out.bz2
Memory

For details, please contact louberger

[NetDEF-CI]

Continuous Integration Result: SUCCESSFUL

Congratulations, this patch passed basic tests

Tested-by: NetDEF / OpenSourceRouting.org CI System

CI System Testrun URL: https://ci1.netdef.org/browse/FRR-FRRPULLREQ-9385/

This is a comment from an automated CI system.
For questions and feedback in regards to this CI system, please feel free to email
Martin Winter - mwinter (at) opensourcerouting.org.

---

CLANG Static Analyzer Summary

• Github Pull Request 5212, comparing to Git base SHA 3e6fd94

Fixed warnings:

• Dead store: Dead assignment in bgp_evpn.c, function install_evpn_route_entry, line 2612

New warnings:

• Logic error: Dereference of null pointer in nhrpd.h, function notifier_call, line 79
  • See https://ci1.netdef.org/browse/FRR-FRRPULLREQ-9385/artifact/shared/static_analysis/report-3f50b7.html#EndPath

Static Analysis warning summary compared to base:

• Fixed warnings: 1
• New warnings: 1

1 Static Analyzer issues remaining.

See details at
https://ci1.netdef.org/browse/FRR-FRRPULLREQ-9385/artifact/shared/static_analysis/index.html

[NetDEF-CI]

Continuous Integration Result: SUCCESSFUL

Congratulations, this patch passed basic tests

Tested-by: NetDEF / OpenSourceRouting.org CI System

CI System Testrun URL: https://ci1.netdef.org/browse/FRR-FRRPULLREQ-9391/

This is a comment from an automated CI system.
For questions and feedback in regards to this CI system, please feel free to email
Martin Winter - mwinter (at) opensourcerouting.org.

---

CLANG Static Analyzer Summary

• Github Pull Request 5212, comparing to Git base SHA 3e6fd94

No Changes in Static Analysis warnings compared to base

1 Static Analyzer issues remaining.

See details at
https://ci1.netdef.org/browse/FRR-FRRPULLREQ-9391/artifact/shared/static_analysis/index.html