[0.21] build: link against -lsocket if required for *ifaddrs #21616

1. 
   fanquake commented at 9:50 AM on April 6, 2021: member

   Backports #21486 to the 0.21 branch. Related to #21485.

2. rand: only try and use freeifaddrs if available

   Github-Pull: #21486
   Rebased-From: 87deac66aa747481e6f34fc80599e1e490de3ea0

   e99d6d0c7c
3. build: check if -lsocket is required with *ifaddrs

   Github-Pull: #21486
   Rebased-From: 879215e665a9f348c8d3fa92701c34065bc86a69

   f6896dfde7
4. net: add ifaddrs.h include

   Github-Pull: #21486
   Rebased-From: 4783115fd4cccb46a7f8c592b34fa7c094c29410

   1a9a2cb7dc
5. fanquake added the label Backport on Apr 6, 2021
6. fanquake added this to the milestone 0.21.1 on Apr 6, 2021
7. 
   MarcoFalke commented at 5:31 AM on April 7, 2021: member

   cherry-pick-only ACK 1a9a2cb7dcc60781a3cbca3a7846ff153143260c did not test or review 🚶

   <details><summary>Show signature and timestamp</summary>

   Signature:

   -----BEGIN PGP SIGNED MESSAGE-----
   Hash: SHA512
   
   cherry-pick-only ACK 1a9a2cb7dcc60781a3cbca3a7846ff153143260c did not test or review 🚶
   -----BEGIN PGP SIGNATURE-----
   
   iQGzBAEBCgAdFiEE+rVPoUahrI9sLGYTzit1aX5ppUgFAlwqrYAACgkQzit1aX5p
   pUheWQwAtS0jJQec5c5HHfSoNZUolv4/UDFzplJ9ufelfFvIpJSSiUzkuDTTwjrM
   QTjyCvGnYv1Y0U3fgfOd67aYA7vkjyX89ZC3RNatEExBGmPeATloeGB5+3FyWwBG
   kYtUz0bZFz7+BEUAs2DZIEx17zjLeSa6afd7DR1ywWLVYXxMANzQPNlZchKD8dqU
   3tdhZs5tg7FfuOdcQWzEQ4URxS/GGzN9g5PKQkBy0BVqybM9OaClAaYThe3UNe6g
   xCNbYpPYeFU25sxaELe4WbkwTMHS3UpxyvorailuXFeojv9nbTSZUFzDlmi2eoOY
   E5HAj8OOApuG7M0WutzFnShsEHITBtg/XwCZBW/1U+lViVAtJOiv6rZgu3jzlaYY
   fuXWyxsGum9Z9NDdzmfTvvi/tU7C9XyM6jgJ4dg1w1U3wAcDE/Fg6/Z+S2Sgzc+O
   vX6yGpyDBKtRx7Cq6EeJzkSiq+v48htviNK9WziqvfjoSl/DLWwXXdwYO9MLcg1W
   kKsVdeQG
   =71DY
   -----END PGP SIGNATURE-----
   

   Timestamp of file with hash ae8e5d5e007019c913280493c2fda3c77b8d9f12e03cb73c751e635f92176572 -

   </details>

8. MarcoFalke merged this on Apr 7, 2021
9. MarcoFalke closed this on Apr 7, 2021

   ---

10. fanquake deleted the branch on Apr 7, 2021
11. DrahtBot locked this on Aug 16, 2022

Milestone
0.21.1