fix the assertion in readLinesFromFile

[xry111]

When the file is not terminated by endline, readLineFromFile will append
a '\0' for the last line. In this case pos + lineLength == dstCapacity.

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[embg]

The CI failures are probably unrelated, and #3082 should fix them. If you re-run checks on this PR those jobs shouldn't fail again.

[xry111]

The CI failures are probably unrelated, and #3082 should fix them. If you re-run checks on this PR those jobs shouldn't fail again.

So rebased and force-pushed, waiting for the result...