Fix description in pam_mount and libHX. Add tstrobel as maintainer.

lib/maintainers.nix

···
   the-kenny = "Moritz Ulrich <[e-mail]>";
   thoughtpolice = "Austin Seipp <[e-mail]>";
   tomberek = "Thomas Bereknyei <[e-mail]>";
+  tstrobel = "Thomas Strobel <[e-mail]>";
   ttuegel = "Thomas Tuegel <[e-mail]>";
   tv = "Tomislav Viljetić <[e-mail]>";
   urkud = "Yury G. Kudryashov <[e-mail]>";

pkgs/development/libraries/libHX/default.nix

···
 
   meta = {
     homepage = http://libhx.sourceforge.net/;
-    description = ''
+    longDescription = ''
       libHX is a C library (with some C++ bindings available) that provides data structures
       and functions commonly needed, such as maps, deques, linked lists, string formatting
       and autoresizing, option and config file parsing, type checking casts and more.
       '';
-    maintainers = [];
+    maintainers = [ stdenv.lib.maintainers.tstrobel ];
     platforms = stdenv.lib.platforms.linux;
   };
 }

pkgs/os-specific/linux/pam_mount/default.nix

···
 
   meta = {
     homepage = http://pam-mount.sourceforge.net/;
-    description = "PAM module to mount volumes for a user session.";
-    maintainers = [];
+    description = "PAM module to mount volumes for a user session";
+    maintainers = [ stdenv.lib.maintainers.tstrobel ];
     platforms = stdenv.lib.platforms.linux;
   };
 }