gh-118876: Set ns.temp before invoking its is_absolute method

[i-shenl]

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Fixes an AttributeError that occurs when checking if ns.temp is an absolute path during building from source on Windows.

• Issue: gh-118876

[cpython-cla-bot[bot]]

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[miss-islington-app[bot]]

Thanks @i-shenl for the PR, and @zooba for merging it 🌮🎉.. I'm working now to backport this PR to: 3.12. 🐍🍒⛏🤖

[miss-islington-app[bot]]

Thanks @i-shenl for the PR, and @zooba for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13. 🐍🍒⛏🤖

[bedevere-app[bot]]

GH-118994 is a backport of this pull request to the 3.12 branch.

[bedevere-app[bot]]

GH-118995 is a backport of this pull request to the 3.13 branch.