Various PKCS#7 related fixes,tidies and comments.

util/libeay.num

diff --git a/util/libeay.num b/util/libeay.num
index 1a1b21a..01299b1 100755
--- a/util/libeay.num
+++ b/util/libeay.num
@@ -1619,3 +1619,8 @@
 sk_X509_EXTENSION_push                  1644
 sk_X509_NAME_ENTRY_find                 1645
 X509V3_EXT_i2d                          1646
+X509V3_EXT_val_prn                      1647
+X509V3_EXT_add_list                     1648
+EVP_CIPHER_type                         1649
+EVP_PBE_CipherInit                      1650
+X509V3_add_value_bool_nf                1651