examples/fips_validation: add jansson dependency

Added a check for RTE_HAS_JANSSON into the meson
configuration file for JSON support.

Signed-off-by: Brandon Lo <blo@iol.unh.edu>
Acked-by: Gowrishankar Muthukrishnan <gmuthukrishn@marvell.com>
Acked-by: Fan Zhang <roy.fan.zhang@intel.com>
Tested-by: Jakub Poczatek <jakub.poczatek@intel.com>

examples/fips_validation/meson.build

@@ -21,3 +21,7 @@ sources = files(
         'fips_dev_self_test.c',
         'main.c',
 )
+
+if dpdk_conf.has('RTE_HAS_JANSSON')
+    ext_deps += jansson_dep
+endif