Commits on Sep 25, 2020

1. jruby: fix shebang for binaries in JRuby …

   There are a variety of additional scripts that are included with the
   JRuby installation that use JRuby itself.
   
   For instance the `bin/gem` had the following contents:
   
   ```bash
   ❯ cat /nix/store/kglkqf56ii83yl6yrgcaj5r3s9m2fzr0-jruby-9.2.13.0/bin/gem
   
   load File.join(File.dirname(__FILE__), 'jgem')
   ```
   
   This is clearly wrong. Patchshebangs was not picking up the fix as part
   of stdenv because the patch is not a build input but the final output
   itself.
   
   We have to rely on substituteInPlace so that we get the correct version.
   
   ```bash
   ❯ cat /nix/store/k4fnrn0dcsh2wzw81217r0ywsspb468f-jruby-9.2.13.0/bin/gem
   
   ```

   

   fzakaria committed Sep 25, 2020
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