package/flatcc: add CPE identifier

The cpe:2.3:a:flatcc_project:flatcc:*:*:*:*:*:*:*:*
valid for this package.

See https://nvd.nist.gov/products/cpe/detail/AA7FC7B6-537C-4735-B615-689D3A91C994

Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/flatcc/flatcc.mk

@@ -13,6 +13,8 @@ FLATCC_DEPENDENCIES = host-flatcc
 FLATCC_CONF_OPTS = -DFLATCC_ALLOW_WERROR=OFF
 HOST_FLATCC_CONF_OPTS = -DFLATCC_ALLOW_WERROR=OFF
 
+FLATCC_CPE_ID_VALID = YES
+
 # Disable build of tests and samples
 FLATCC_CONF_OPTS += -DFLATCC_TEST=OFF
 HOST_FLATCC_CONF_OPTS += -DFLATCC_TEST=OFF