New functions sk_set, sk_value and sk_num to replace existing macros: this is
to minimise the effects on existing code.

util/libeay.num

diff --git a/util/libeay.num b/util/libeay.num
index 7be174a..604295b 100755
--- a/util/libeay.num
+++ b/util/libeay.num
@@ -1625,3 +1625,6 @@
 EVP_PBE_CipherInit                      1650
 X509V3_add_value_bool_nf                1651
 d2i_ASN1_UINTEGER                       1652
+sk_value                                1653
+sk_num                                  1654
+sk_set                                  1655