Sets flags to the Store.
flags consists of zero or more of the constants defined in with
name V_FLAG_* or’ed together.
static VALUE
ossl_x509store_set_flags(VALUE self, VALUE flags)
{
X509_STORE *store;
long f = NUM2LONG(flags);
GetX509Store(self, store);
X509_STORE_set_flags(store, f);
return flags;
}