support/dependencies/dependencies.sh: check for JSON:PP Perl module
The JSON::PP Perl module is used at build time by the webkitgtk and
wpewebkit packages.
Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit e0c879509d936c003eb1f4bd497bc86f45829322)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>