[ruby-core:98744] [Ruby master Bug#16952] Kernel.exec gives an incorrect error message when passed a script with a non-existing shebang

Issue #16952 has been reported by deivid (David Rodr刕uez).

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Bug #16952: Kernel.exec gives an incorrect error message when passed a script with a non-existing shebang
https://bugs.ruby-lang.org/issues/16952

* Author: deivid (David Rodr刕uez)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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```
$ cat myscript.rb 
#!/bad/ruby/shebang

puts "Hei!"

$ ruby -e 'Kernel.exec("myscript.rb")'

Traceback (most recent call last):
	1: from -e:1:in `<main>'
-e:1:in `exec': No such file or directory - myscript.rb (Errno::ENOENT)
```

From the error, I understand that the script is not there, but the script is clearly there.

I would've expected something more similar to what you get if you try to run the script directly from the shell:

```
$ ./myscript.rb 
bash: ./myscript.rb: /bad/ruby/shebang: bad interpreter: No such file or directory
```



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