Fix regression: Missing "disable-output-buffering" option since meson builds #1603

Job	Run time
init (ubuntu-22.04)	26s
init (ubuntu-24.04)	29s
Build using autoconf tarball (ubuntu-22.04)	4m 10s
Code QL Analyze (ubuntu-22.04)	6m 0s
Build using autoconf tarball (ubuntu-24.04)	4m 32s
Code QL Analyze (ubuntu-24.04)	6m 32s
cognitive-complexity	17s
compile (ubuntu-22.04)	2m 26s
compile (ubuntu-22.04, -Dbuildtype=debug -Db_lto=false)	2m 5s
scan-build	18s
compile (ubuntu-22.04, -Dbuildtype=debug -Db_lto=false -Dplugin-syscalls=false)	2m 0s
compile (ubuntu-22.04, -Dbuildtype=debug -Db_lto=false -Db_sanitize=address,undefined)	2m 2s
compile (ubuntu-22.04, -Dbuildtype=debug -Db_lto=false -Drepl=true)	1m 52s
compile (ubuntu-22.04, -Dbuildtype=debug -Db_lto=false -Dthreadsafety=true)	1m 52s
compile (ubuntu-24.04)	2m 22s
compile (ubuntu-24.04, -Dbuildtype=debug -Db_lto=false)	2m 8s
compile (ubuntu-24.04, -Dbuildtype=debug -Db_lto=false -Dplugin-syscalls=false)	1m 48s
compile (ubuntu-24.04, -Dbuildtype=debug -Db_lto=false -Db_sanitize=address,undefined)	2m 10s
compile (ubuntu-24.04, -Dbuildtype=debug -Db_lto=false -Drepl=true)	1m 58s
compile (ubuntu-24.04, -Dbuildtype=debug -Db_lto=false -Dthreadsafety=true)	1m 56s
	47m 23s

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