Fix Windows tests for `.inputrc` code

[maxlandon]

There is a weird bug with Github actions running tests for inputrc package on Windows:
The testdata files are read correctly, but split accordingly to their delimiters.
The tests therefore fail.

Example workflow failure: https://github.com/reeflective/readline/actions/runs/4904982567/jobs/8758471276

Function failing (bytes.Split has everything it needs but does not do its job):

readline/inputrc/inputrc_test.go

Line 181 in 276299f

return bytes.Split(buf, []byte(delimiter))

The tests however work correctly when run locally on a Windows machine.

[maxlandon]

As of this date the issue in question has been resolved despite many attempts.
The issue is still the same: on Github actions, the parsing of user-default .inputrc files fails because the parser
does not split the test files in sections of vars/binds/others, based on the delimiters.

It only fails so with these user-defined-default tests. All other tests making use of such section-delimited testdata files work normally.

Some of my debugs show that in my cases (if not all), the call to bytes.Split(buf, []byte(delimiter)) does actually not split the files correctly on Windows.
However, trying to replace the \n of the ####----####\n default delimiter in the Go code with \r\n did not solve the issue.

[maxlandon]

Solved in PR #85