regression on -current with json-glib

json-glib doesn't build anymore on -current:
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json-glib-1.6.6/subprojects/glib.wrap
The Meson build system
Version: 0.60.0
Source dir: /tmp/json-glib-1.6.6
Build dir: /tmp/json-glib-1.6.6/build
Build type: native build

../meson.build:1:0: ERROR: Unknown options: "docs"

A full log can be found at /tmp/json-glib-1.6.6/build/meson-logs/meson-log.txt
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