doc: Change remaining http links to gnupg.org to https

--
GnuPG-bug-id: 1830

doc/gpg.texi

@@ -376,7 +376,7 @@ useful for debugging.
 Present a menu to work with a smartcard. The subcommand "help" provides
 an overview on available commands. For a detailed description, please
 see the Card HOWTO at
-http://www.gnupg.org/documentation/howtos.html#GnuPG-cardHOWTO .
+https://gnupg.org/documentation/howtos.html#GnuPG-cardHOWTO .
 
 @item --card-status
 @opindex card-status

g10/misc.c

@@ -563,7 +563,7 @@ idea_cipher_warn(int show)
     {
       log_info(_("the IDEA cipher plugin is not present\n"));
       log_info(_("please see %s for more information\n"),
-               "http://www.gnupg.org/faq/why-not-idea.html");
+               "https://gnupg.org/faq/why-not-idea.html");
       warned=1;
     }
 }

g10/sig-check.c

@@ -105,7 +105,7 @@ signature_check2 (PKT_signature *sig, gcry_md_hd_t digest, u32 *r_expiredate,
 		log_info(_("WARNING: signing subkey %s is not"
 			   " cross-certified\n"),keystr_from_pk(pk));
 		log_info(_("please see %s for more information\n"),
-			 "http://www.gnupg.org/faq/subkey-cross-certify.html");
+			 "https://gnupg.org/faq/subkey-cross-certify.html");
 		/* --require-cross-certification makes this warning an
                      error.  TODO: change the default to require this
                      after more keys have backsigs. */