dnsdist: Fix remaining build issues for YAML with meson #2651

Job	Run time
generate docker runner image name	1s
swagger-syntax-check	1m 5s
build recursor (asan+ubsan, least, autotools)	44s
build dnsdist (autotools, asan+ubsan, least)	44s
build recursor (asan+ubsan, least, meson)	43s
build auth (autotools)	46s
build dnsdist (autotools, asan+ubsan, full)	42s
build recursor (asan+ubsan, full, autotools)	44s
build auth (meson)	45s
build dnsdist (autotools, tsan, full)	42s
build recursor (asan+ubsan, full, meson)	46s
build dnsdist (meson, asan+ubsan, least)	45s
build recursor (tsan, full, autotools)	43s
build dnsdist (meson, asan+ubsan, full)	43s
test-auth-api	0s
test-ixfrdist	0s
test-auth-backend	0s
test-dnsdist-regression	0s
test rec mini bulk	0s
test-recursor-api	0s
test-recursor-regression	0s
test rec ubicloud bulk	0s
collect	12s
	10m 5s

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