package/cryptopp: add CPE variables

cpe:2.3:a:cryptopp:crypto\+\+ is a valid CPE identifier for this
package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&orderBy=2.3&keyword=cpe%3A2.3%3Aa%3Acryptopp%3Acrypto%5C%2B%5C%2B

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/cryptopp/cryptopp.mk

@@ -9,6 +9,8 @@ CRYPTOPP_SOURCE = cryptopp$(subst .,,$(CRYPTOPP_VERSION)).zip
 CRYPTOPP_SITE = https://cryptopp.com
 CRYPTOPP_LICENSE = BSL-1.0, BSD-3-Clause (CRYPTOGAMS), Public domain (ChaCha SSE2 and AVX)
 CRYPTOPP_LICENSE_FILES = License.txt
+CRYPTOPP_CPE_ID_VENDOR = cryptopp
+CRYPTOPP_CPE_ID_PRODUCT = crypto\+\+
 CRYPTOPP_INSTALL_STAGING = YES
 
 define HOST_CRYPTOPP_EXTRACT_CMDS