make MaxBackends available in _PG

    Attachment (v9-0001-Add-a-new-shmem_request_hook-hook.patch) at 2022-05-13 00:15:15 from Michael Paquier <michael at paquier.xyz> (Patch: Yes)
    Attachment (v8-0001-Remove-logic-for-unloading-dynamically-loaded-fil.patch) at 2022-05-11 04:12:11 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v7-0001-Add-a-new-shmem_request_hook-hook.patch) at 2022-05-10 15:56:28 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v6-0001-Add-a-new-shmem_request_hook-hook.patch) at 2022-05-06 21:15:21 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v5-0001-Fix-comments-about-bgworker-registration-before-M.patch) at 2022-04-19 15:46:58 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v4-0001-Fix-comments-about-bgworker-registration-before-M.patch) at 2022-04-18 22:52:44 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v3-0001-Fix-comments-about-bgworker-registration-before-M.patch) at 2022-04-12 22:26:16 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v2-0001-Revert-GetMaxBackends.patch) at 2022-04-11 21:14:35 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v1-0001-Revert-GetMaxBackends.patch) at 2022-04-11 16:44:08 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v1-0001-POC-Add-a-new-shmem_request_hook-hook.patch) at 2022-03-25 03:11:46 from Julien Rouhaud <rjuju123 at gmail.com> (Patch: Yes)
    Attachment (fix_typo.patch) at 2022-02-09 17:53:38 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (max-backends-stuff.patch) at 2022-02-09 05:17:59 from Michael Paquier <michael at paquier.xyz> (Patch: Yes)
    Attachment (v9-0001-Disallow-external-access-to-MaxBackends.patch) at 2022-02-04 20:13:49 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v8-0001-Disallow-external-access-to-MaxBackends.patch) at 2022-02-04 05:54:57 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v7-0001-Adjust-comments-about-registering-background-work.patch) at 2022-01-27 18:18:15 from Nathan Bossart <nathandbossart at gmail.com> (Patch: Yes)
    Attachment (v6-0001-Disallow-external-access-to-MaxBackends.patch) at 2022-01-07 20:20:02 from "Bossart, Nathan" <bossartn at amazon.com> (Patch: Yes)
    Attachment (v5-0001-Disallow-external-access-to-MaxBackends.patch) at 2022-01-07 18:09:23 from "Bossart, Nathan" <bossartn at amazon.com> (Patch: Yes)
    Attachment (v4-0001-Disallow-external-access-to-MaxBackends.patch) at 2021-08-16 04:02:16 from "Bossart, Nathan" <bossartn at amazon.com> (Patch: Yes)
    Attachment (v3-0001-Disallow-external-access-to-MaxBackends.patch) at 2021-08-10 00:22:50 from "Bossart, Nathan" <bossartn at amazon.com> (Patch: Yes)
    Attachment (v2-0001-Disallow-external-access-to-MaxBackends.patch) at 2021-08-07 18:01:41 from "Bossart, Nathan" <bossartn at amazon.com> (Patch: Yes)
    Attachment (v1-0001-Disallow-external-access-to-MaxBackends.patch) at 2021-08-03 23:13:26 from "Bossart, Nathan" <bossartn at amazon.com> (Patch: Yes)
    Attachment (v1-0001-Calculate-MaxBackends-earlier-in-PostmasterMain.patch) at 2021-08-02 18:18:25 from "Bossart, Nathan" <bossartn at amazon.com> (Patch: Yes)
    Attachment (0001-Make-MaxBackends-available-in-_PG_init.patch) at 2020-09-21 03:43:41 from "Wang, Shenhao" <wangsh.fnst at cn.fujitsu.com> (Patch: Yes)

make MaxBackends available in _PG_init