Fix regression: Missing "disable-output-buffering" option since meson builds #1598

Job	Run time
init (ubuntu-22.04)	11m 16s
init (ubuntu-24.04)	13m 59s
Code QL Analyze (ubuntu-22.04)	1m 54s
compile (ubuntu-22.04)	1m 10s
Code QL Analyze (ubuntu-24.04)	1m 2s
scan-build	17s
compile (ubuntu-22.04, -Dbuildtype=debug -Db_lto=false)	58s
cognitive-complexity	40s
compile (ubuntu-22.04, -Dbuildtype=debug -Db_lto=false -Dplugin-syscalls=false)	1m 0s
Build using autoconf tarball (ubuntu-22.04)	4m 10s
Build using autoconf tarball (ubuntu-24.04)	7m 4s
compile (ubuntu-22.04, -Dbuildtype=debug -Db_lto=false -Db_sanitize=address,undefined)	1m 11s
compile (ubuntu-22.04, -Dbuildtype=debug -Db_lto=false -Drepl=true)	1s
compile (ubuntu-22.04, -Dbuildtype=debug -Db_lto=false -Dthreadsafety=true)	40s
compile (ubuntu-24.04)	1s
compile (ubuntu-24.04, -Dbuildtype=debug -Db_lto=false)	1s
compile (ubuntu-24.04, -Dbuildtype=debug -Db_lto=false -Dplugin-syscalls=false)	43s
compile (ubuntu-24.04, -Dbuildtype=debug -Db_lto=false -Db_sanitize=address,undefined)	1s
compile (ubuntu-24.04, -Dbuildtype=debug -Db_lto=false -Drepl=true)	1s
compile (ubuntu-24.04, -Dbuildtype=debug -Db_lto=false -Dthreadsafety=true)	1s
	46m 10s

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