RFR: 8301753: AppendFile/WriteFile has differences between make 3.81 and 4+

[Erik Joelsson]

On Thu, 16 Feb 2023 19:08:53 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> This is a retake on https://github.com/openjdk/jdk/pull/12461. Changes compared to the original patch:
> 
> Both WriteFile and AppendFile are fixed. 
> 
> It turned out we actually did a `$(strip)` on the input for the `$(file)` variant, so for consistency we should do that for the make 3.81 as well. Almost as a side-effect, this will also handle the problem of risking to add multiple newlines, since any trailing newlines will be removed by the strip, and then we can always append a newline.
> 
> Unit tests are added. I have verified functionality on make 3.81, 4.0 and 4.4.

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/12605