package/libgit2: add LIBGIT2_CPE_ID_VENDOR

cpe:2.3:a:libgit2:libgit2 is a valid CPE identifier for this package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe%3A2.3%3Aa%3Alibgit2%3Alibgit2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libgit2/libgit2.mk

@@ -8,6 +8,7 @@ LIBGIT2_VERSION = 1.1.0
 LIBGIT2_SITE = https://github.com/libgit2/libgit2/releases/download/v$(LIBGIT2_VERSION)
 LIBGIT2_LICENSE = GPL-2.0 with linking exception, MIT (sha1), wildmatch license (wildmatch)
 LIBGIT2_LICENSE_FILES = COPYING
+LIBGIT2_CPE_ID_VALID = YES
 LIBGIT2_INSTALL_STAGING = YES
 
 LIBGIT2_CONF_OPTS = \