Make pkcs12 and smime applications seed random number

generator (otherwise they don't work) and add -rand
option. Update docs.

doc/apps/pkcs12.pod

@@ -41,6 +41,7 @@ B<openssl> B<pkcs12>
 [B<-envpassin var>]
 [B<-passout password>]
 [B<-envpassout var>]
+[B<-rand file(s)>]
 
 =head1 DESCRIPTION
 
@@ -253,6 +254,13 @@ option.
 This option is included for compatibility with previous versions, it used
 to be needed to use MAC iterations counts but they are now used by default.
 
+=item B<-rand file(s)>
+
+a file or files containing random data used to seed the random number
+generator. Multiple files can be specified separated by a OS-dependent
+character.  For MS-Windows, the separator is B<;>.  For OpenVMS, it's
+B<,>.  For all others, it's B<:>.
+
 =back
 
 =head1 NOTES

doc/apps/smime.pod

@@ -28,6 +28,7 @@ B<openssl> B<smime>
 [B<-from ad>]
 [B<-subject s>]
 [B<-text>]
+[B<-rand file(s)>]
 [cert.pem]...
 
 =head1 DESCRIPTION
@@ -173,6 +174,13 @@ corresponding certificate. If this option is not specified then the
 private key must be included in the certificate file specified with
 the B<-recip> or B<-signer> file.
 
+=item B<-rand file(s)>
+
+a file or files containing random data used to seed the random number
+generator. Multiple files can be specified separated by a OS-dependent
+character.  For MS-Windows, the separator is B<;>.  For OpenVMS, it's
+B<,>.  For all others, it's B<:>.
+
 =item B<cert.pem...>
 
 one or more certificates of message recipients: used when encrypting