spamassassin: support for fetching rules over HTTPS

sa-update.service starts by making an HTTP GET request to
http://spamassassin.apache.org/updates/MIRRORED.BY, which now
redirects to HTTPS.  Since we didn't have the appropriate library
available to handle HTTPS, rule updates would fail:

Jan 03 12:35:03 atuin systemd[1]: Starting sa-update.service...
Jan 03 12:35:10 atuin sa-update-start[1250]: Update available for channel updates.spamassassin.org: 1895535 -> 1896618
Jan 03 12:35:10 atuin sa-update-start[1250]: http: (lwp) hotpatching IO::Socket::INET by module IO::Socket::IP
Jan 03 12:35:11 atuin sa-update-start[1250]: http: (lwp) GET http://spamassassin.apache.org/updates/MIRRORED.BY, 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed)
Jan 03 12:35:11 atuin sa-update-start[1250]: error: unable to refresh mirrors file for channel updates.spamassassin.org, using old file
Jan 03 12:35:11 atuin sa-update-start[1250]: error: no mirror data available for channel updates.spamassassin.org
Jan 03 12:35:11 atuin sa-update-start[1250]: channel 'updates.spamassassin.org': MIRRORED.BY file contents were missing, channel failed
Jan 03 12:35:11 atuin sa-update-start[1250]: Update failed, exiting with code 4
Jan 03 12:35:11 atuin systemd[1]: sa-update.service: Main process exited, code=exited, status=4/NOPERMISSION
Jan 03 12:35:11 atuin systemd[1]: sa-update.service: Failed with result 'exit-code'.
Jan 03 12:35:11 atuin systemd[1]: Failed to start sa-update.service.

pkgs/servers/mail/spamassassin/default.nix

@@ -9,11 +9,18 @@ perlPackages.buildPerlPackage rec {
     sha256 = "044ng2aazqy8g0m17q0a4939ck1ca4x230q2q7q7jndvwkrpaj5w";
   };
 
-  nativeBuildInputs = [ makeWrapper ];
+  # ExtUtil::MakeMaker is bundled with Perl, but the bundled version
+  # causes build errors for aarch64-darwin, so we override it with the
+  # latest version.  We can drop the dependency to go back to the
+  # bundled version when the version that comes with Perl is ≥7.57_02.
+  #
+  # Check the version bundled with Perl like this:
+  #   perl -e 'use ExtUtils::MakeMaker qw($VERSION); print "$VERSION\n"'
+  nativeBuildInputs = [ makeWrapper perlPackages.ExtUtilsMakeMaker ];
   buildInputs = (with perlPackages; [
     HTMLParser NetCIDRLite NetDNS NetAddrIP DBFile HTTPDate MailDKIM LWP
-    IOSocketSSL DBI EncodeDetect IPCountry NetIdent Razor2ClientAgent MailSPF
-    NetDNSResolverProgrammable Socket6
+    LWPProtocolHttps IOSocketSSL DBI EncodeDetect IPCountry NetIdent
+    Razor2ClientAgent MailSPF NetDNSResolverProgrammable Socket6
   ]);
 
   # Enabling 'taint' mode is desirable, but that flag disables support