package/cpp-httplib: add CPE identifier

The cpe:2.3:a:cpp-httplib_project:cpp-httplib:*:*:*:*:*:*:*:* is valid
for this package.

See https://nvd.nist.gov/products/cpe/detail/955012E0-158A-4637-99DE-37520A12BB7D

Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/cpp-httplib/cpp-httplib.mk

@@ -8,6 +8,7 @@ CPP_HTTPLIB_VERSION = 0.19.0
 CPP_HTTPLIB_SITE = $(call github,yhirose,cpp-httplib,v$(CPP_HTTPLIB_VERSION))
 CPP_HTTPLIB_LICENSE = MIT
 CPP_HTTPLIB_LICENSE_FILES = LICENSE
+CPP_HTTPLIB_CPE_ID_VALID = YES
 CPP_HTTPLIB_INSTALL_STAGING = YES
 CPP_HTTPLIB_CONF_OPTS = \
 	-Dcpp-httplib_test=false