ssl-cert.eclass: remove = slot operator from DEPEND

It is common practice to include := in DEPENDs even though slot
operators are only meaningful in RDEPENDs because one often sees
RDEPEND="${DEPEND} ...".  However, the scope of DEPEND does not
cross the boundary between eclass and inhering ebuild, so that
operator is useless here.

eclass/ssl-cert.eclass

@@ -30,10 +30,10 @@
 
 if [[ "${SSL_DEPS_SKIP}" == "0" ]]; then
 	if [[ "${SSL_CERT_MANDATORY}" == "0" ]]; then
-		DEPEND="${SSL_CERT_USE}? ( dev-libs/openssl:0= )"
+		DEPEND="${SSL_CERT_USE}? ( dev-libs/openssl:0 )"
 		IUSE="${SSL_CERT_USE}"
 	else
-		DEPEND="dev-libs/openssl:0="
+		DEPEND="dev-libs/openssl:0"
 	fi
 fi