package/libtommath: add LIBTOMMATH_CPE_ID_VENDOR

cpe:2.3:a:libtom:libtommath is a valid CPE identifier for this package:

  https://nvd.nist.gov/products/cpe/detail/F0D99614-AA27-4713-ADD2-103647C8838B

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 17ffb91551cc7c76427fd9675bc5e5a01d683afe)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libtommath/libtommath.mk

@@ -9,6 +9,7 @@ LIBTOMMATH_SITE = https://github.com/libtom/libtommath/releases/download/v$(LIBT
 LIBTOMMATH_SOURCE = ltm-$(LIBTOMMATH_VERSION).tar.xz
 LIBTOMMATH_LICENSE = Unlicense
 LIBTOMMATH_LICENSE_FILES = LICENSE
+LIBTOMMATH_CPE_ID_VENDOR = libtom
 LIBTOMMATH_INSTALL_STAGING = YES
 LIBTOMMATH_INSTALL_TARGET = NO  # only static library