Sergey Biryukov 3b926e0b47 Upgrade/Install: As a follow-up to [45357], when linking to Update PHP support page in error messages, check if wp_get_update_php_url() and wp_get_update_php_annotation() exist.
`wp-admin/includes/update-core.php` runs in the context of the previous WordPress version. Any calls to newly introduced functions there need to be checked via `function_exists()`.

Reviewed by desrosj, earnjam, SergeyBiryukov.

Props dd32, imath.
Fixes #47323.
Built from https://develop.svn.wordpress.org/trunk@45365


git-svn-id: http://core.svn.wordpress.org/trunk@45176 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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