package/cjson: set CJSON_CPE_ID_VALID

cpe:2.3🅰️cjson_project:cjson is a valid CPE identifier for this
package:

https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cjson

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/cjson/cjson.mk

@@ -9,6 +9,7 @@ CJSON_SITE = $(call github,DaveGamble,cjson,v$(CJSON_VERSION))
 CJSON_INSTALL_STAGING = YES
 CJSON_LICENSE = MIT
 CJSON_LICENSE_FILES = LICENSE
+CJSON_CPE_ID_VALID = YES
 # Set ENABLE_CUSTOM_COMPILER_FLAGS to OFF in particular to disable
 # -fstack-protector-strong which depends on BR2_TOOLCHAIN_HAS_SSP
 CJSON_CONF_OPTS += \