Consider this inline invocation in a Windows Command Prompt:
```
C:\msys2\msys2_shell.cmd -defterm -no-start -mingw64 -here -c $@ -- echo hello there, --world=windows
```
This currently produces:
>hello there, --world windows
Note the absence of the `=` character. This is due to the word-splitting done by `cmd.exe` to form the positional parameters (`%1` - `%9`). The same word-splitting is not done on the `%*` special variable, so derive the remaining command line arguments.
With this fix, the above command produces:
>hello there, --world=windows
