Add ifdef for NumberFormatter::ROUND_HALFODD

According to the docs, UNUM_ROUND_HALF_ODD is only available since ICU 69.0. The build on Travis currently fails probably because it uses a lower

Add ifdef for NumberFormatter::ROUND_HALFODD

According to the docs, UNUM_ROUND_HALF_ODD is only available since ICU 69.0. The build on Travis currently fails probably because it uses a lower version.

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ext/intl: Add NumberFormatter::ROUND_HALFODD

The NumberFormatter::ROUND_HALFEVEN constant exists in PHP already, but its counterpart ROUND_HALFODD was missing.
This adds it, using `UNUM_

ext/intl: Add NumberFormatter::ROUND_HALFODD

The NumberFormatter::ROUND_HALFEVEN constant exists in PHP already, but its counterpart ROUND_HALFODD was missing.
This adds it, using `UNUM_ROUND_HALF_ODD`

Close GH-13191

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RFC: Add 4 new rounding modes to round() function (#12056)

https://wiki.php.net/rfc/new_rounding_modes_to_round_function

Co-authored-by: Tim Düsterhus <tim@bastelstu.be>