thunderbird: reintroduce buildconfig patch to reduce closure size

This (partially) reverts commit 9ea377439e.

pkgs/applications/networking/mailreaders/thunderbird/no-buildconfig.patch

@@ -0,0 +1,13 @@
+Remove about:buildconfig.  If used as-is, it would add unnecessary runtime dependencies.
+--- a/comm/mail/base/jar.mn
++++ b/comm/mail/base/jar.mn
+@@ -119,9 +119,6 @@ messenger.jar:
+ % override chrome://mozapps/content/profile/profileDowngrade.js chrome://messenger/content/profileDowngrade.js
+ % override chrome://mozapps/content/profile/profileDowngrade.xhtml chrome://messenger/content/profileDowngrade.xhtml
+ 
+-*   content/messenger/buildconfig.html              (content/buildconfig.html)
+-% override chrome://global/content/buildconfig.html chrome://messenger/content/buildconfig.html
+-
+ # L10n resources and overrides.
+ % override chrome://mozapps/locale/profile/profileDowngrade.dtd chrome://messenger/locale/profileDowngrade.dtd
+ % override chrome://global/locale/netError.dtd chrome://messenger/locale/netError.dtd

pkgs/applications/networking/mailreaders/thunderbird/packages.nix

@@ -18,6 +18,8 @@ rec {
       sha512 = "4938f676ddeeba37da1f2086d76a2ef2c870738169f7e10b35b83e4ed772df634825ee25c28232df1ac1e3a18a9466e97dc7ee318abbf43f1f4ce6479a13975b";
     };
     patches = [
+      # The file to be patched is different from firefox's `no-buildconfig-ffx90.patch`.
+      ./no-buildconfig.patch
     ];
 
     meta = with lib; {