meson setup --reconfigure handling of builtin options is broken in git master #12920
Description
Builtin options are not handled correctly when specified on the meson setup --reconfigure command line.
To Reproduce
$ cat > meson.build <<EOF
projet('foo')
EOF
$ meson setup build
$ meson setup build --reconfigure -Db_ndebug=true
The Meson build system
Version: 1.4.0.rc1
Source dir: /private/tmp/test-meson
Build dir: /private/tmp/test-meson/build
Build type: native build
meson.build:1:0: ERROR: Unknown options: "b_ndebug"
A full log can be found at /private/tmp/test-meson/build/meson-logs/meson-log.txt