Debbie's 2.3 build is broken

[Algunenano]

It seems that at some recent point in the past, Debbie updated its JSON-C to a newer release and 2.3 doesn't have support for it:

libtool: compile:  gcc -I/var/lib/jenkins/workspace/geos/rel-3.6w64/include -I/usr/include/libxml2 -I/usr/include -DHAVE_SFCGAL -g -O2 -fPIC -DPIC -Wall -Wmissing-prototypes -I/var/lib/jenkins/workspace/geos/rel-3.6w64/include -I/usr/include -DHAVE_SFCGAL -c lwin_geojson.c  -fPIC -DPIC -o .libs/lwin_geojson.o
lwin_geojson.c:36:10: fatal error: json-c/json_object_private.h: No such file or directory
   36 | #include <json-c/json_object_private.h>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

Support for json-c 0.13+ is available only in 2.4 and onwards.

[Raul Marin]

In 17792:

Backport json-c 0.13 support

References #4497
Closes ​https://github.com/postgis/postgis/pull/471

[Algunenano]

Healed