libsuricata: trivial example - v3

[jasonish]

• Trivial libsuricata example, just linking and wrap Suricata main
• Update example plugin Makefile to build even when --disable-shared is used.
• fix "autoconf.h" header include, should someone choose to `#include "suricata/suricata-common.h"
• remove autoconf.h from dist, it never belonged there.

[suricata-qa]

Information:

ERROR: QA failed on SURI_TLPW2_autofp_suri_time.

field	baseline	test	%
	SURI_TLPW2_autofp_stats_chk
.uptime	101	111	109.9%
	TREX_GENERIC_stats_chk
.capture.kernel_drops	0	1	0.00

Pipeline 18545

[victorjulien]

Merged in #10469, thanks!