refactor: use external constant and update license in math/base/special/pow

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• completes the TODO to use external constant for HIGH_NUM_SIGNIFICAND_BITS, i.e., constants/float64/num-high-word-significand-bits, in math/base/special/pow.
• updates the license header in main.c, to match with that in main.js.

Related Issues

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None.

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[Planeshifter]

Thanks! PR looks fine. Noticing that linting fails due to different parameter names for pow between the C source and header files. Would you be able to rectify that as part of this PR?

[gunjjoshi]

Thanks! PR looks fine. Noticing that linting fails due to different parameter names for pow between the C source and header files. Would you be able to rectify that as part of this PR?

Made the changes, @Planeshifter. Thanks for the suggestions!

[stdlib-bot]

PR Commit Message

refactor: use external constant and update license in `math/base/special/pow`

PR-URL: https://github.com/stdlib-js/stdlib/pull/3082

Reviewed-by: Philipp Burckhardt <[email protected]>
Signed-off-by: Gunj Joshi <[email protected]>

Please review the above commit message and make any necessary adjustments.