Unexpected jruby.sh error messages on Windows

**Environment Information**

Provide at least:
* JRuby version (`jruby -v`) and command line (flags, JRUBY_OPTS, etc)

  https://github.com/nobu/resolv/actions/runs/20025503657/job/57421825526#step:3:39
  ```
  C:\Windows\system32\cmd.exe /D /S /C "D:\jruby-head\bin\ruby.bat --version"
  jruby 10.0.3.0-SNAPSHOT (3.4.5) 2025-12-07 9944d191ec OpenJDK 64-Bit Server VM 21.0.9+10-LTS on 21.0.9+10-LTS +indy +jit [x86_64-mswin32]
  ```

* Operating system and platform (e.g. `uname -a`)

  https://github.com/nobu/resolv/actions/runs/20025503657/job/57421825526#step:1:9
  ```
  Microsoft Windows Server 2025
  10.0.26100
  Datacenter
  ```

**Expected Behavior**

`jruby.sh` runs gently, without error messages.
jruby-10.0.2.0 was expectedly.

**Actual Behavior**

https://github.com/nobu/resolv/actions/runs/20025503657/job/57421825526#step:5:15
```
/d/jruby-head/bin/jruby.sh: line 580: [: "21: integer expected
/d/jruby-head/bin/jruby.sh: line 589: [: "21: integer expected
/d/jruby-head/bin/jruby.sh: line 600: [: "21: integer expected
/d/jruby-head/bin/jruby.sh: line 608: [: "21: integer expected
/d/jruby-head/bin/jruby.sh: line 616: [: "21: integer expected
/d/jruby-head/bin/jruby.sh: line 580: [: "21: integer expected
/d/jruby-head/bin/jruby.sh: line 589: [: "21: integer expected
/d/jruby-head/bin/jruby.sh: line 600: [: "21: integer expected
/d/jruby-head/bin/jruby.sh: line 608: [: "21: integer expected
/d/jruby-head/bin/jruby.sh: line 616: [: "21: integer expected
```

`$java_major` seems to contain a double quote.

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Unexpected jruby.sh error messages on Windows #9122

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Unexpected jruby.sh error messages on Windows #9122

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