Commits on Feb 20, 2023

1. Prefer readlink to greadlink …

   rbenv tries to find `greadlink` and then `readlink`. However, there is
   usually no `greadlink` in Linux. Looking for `greadlink` could be a
   significant overhead on some environments where `PATH` contains many
   directories.
   
   Ubuntu on WSL2 is just such an environment. Looking for `readlink`
   before `greadlink` speeds up ruby startup.
   
   Before this change:
   
   ```
   $ time ruby -v
   ruby 3.3.0dev (2023-02-20T01:33:06Z master 7d5794bad5) [x86_64-linux]
   
   real    0m0.532s
   user    0m0.022s
   sys     0m0.087s
   ```
   
   After this change:
   
   ```
   $ time ruby -v
   ruby 3.3.0dev (2023-02-20T01:33:06Z master 7d5794bad5) [x86_64-linux]
   
   real    0m0.419s
   user    0m0.042s
   sys     0m0.055s
   ```

   

   mame committed Feb 20, 2023
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