add patches for Ambertools 21 to Amber 20.11 to work with new Amber easyblock

[zemu-unile]

(created using eb --new-pr)
Patches were taken from #16151

[zemu-unile]

Required after easybuilders/easybuild-easyblocks#2781 (in EasyBuild 4.6.1)

[zemu-unile]

I am not sure why, but the patches were not required for the fosscuda variant https://github.com/zemu-unile/easybuild-easyconfigs/blob/20220930160030_new_pr_Amber2011/easybuild/easyconfigs/a/Amber/Amber-20.11-fosscuda-2020b-AmberTools-21.3.eb

[zemu-unile]

Tests depend on #16166

[akesandgren]

I am not sure why, but the patches were not required for the fosscuda variant https://github.com/zemu-unile/easybuild-easyconfigs/blob/20220930160030_new_pr_Amber2011/easybuild/easyconfigs/a/Amber/Amber-20.11-fosscuda-2020b-AmberTools-21.3.eb

That's because that specific easyconfig doesn't run the tests at all.

[akesandgren]

LGTM

Still having problems with alt_location and checksum verification.

[akesandgren]

Test report by @akesandgren
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in total)
b-an02.hpc2n.umu.se - Linux Ubuntu 20.04, x86_64, Intel(R) Xeon(R) CPU E5-2690 v4 @ 2.60GHz, Python 3.8.10
See https://gist.github.com/5ff6ec9a51c7d0c67b75b383b716a452 for a full test report.

[akesandgren]

We need easybuilders/easybuild-framework#4093 to make alt_location and patch checksumming work for Amber since there are old versions of at least one patch still in Amber while we now use the one from AmberTools.

[akesandgren]

LGTM

[akesandgren]

Going in, thanks @zemu-unile!