config: fix compilation with `FLB_HAVE_STATIC_CONF` (#7536) #1992

Job	Run time
Staging build matrix	1s
master-build-packages / Extract any supporting metadata	18s
master-build-packages / debian/bullseye package build and stage to S3	4m 57s
master-build-packages / ubuntu/20.04 package build and stage to S3	5m 34s
master-build-packages / ubuntu/22.04 package build and stage to S3	5m 19s
master-build-packages / centos/7 package build and stage to S3	4m 31s
master-build-packages / Create repo metadata in S3	0s
	20m 40s

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