add missing source_urls for SimpleITK 2.1.1.2

[smoors]

(created using eb --new-pr)

[smoors]

@boegelbot please test @ jsc-zen2 EB_ARGS="--force-download"

[boegelbot]

@smoors: Request for testing this PR well received on jsczen2l1.int.jsc-zen2.easybuild-test.cluster

PR test command 'EB_PR=18212 EB_ARGS="--force-download" /opt/software/slurm/bin/sbatch --mem-per-cpu=4000M --job-name test_PR_18212 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen2.sh' executed!

• exit code: 0
• output:

Submitted batch job 2902

Test results coming soon (I hope)...

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Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[branfosj]

Test report by @branfosj
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in total)
bb-pg-login02.bb2.cluster - Linux RHEL 8.6, x86_64, Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz (broadwell), Python 3.6.8
See https://gist.github.com/branfosj/1fe613a988f852dfa71dcb8b27c544e2 for a full test report.

[boegelbot]

Test report by @boegelbot
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in total)
jsczen2c1.int.jsc-zen2.easybuild-test.cluster - Linux Rocky Linux 8.5, x86_64, AMD EPYC 7742 64-Core Processor (zen2), Python 3.6.8
See https://gist.github.com/boegelbot/267bf03db239255a93964718d48d4bb9 for a full test report.

[branfosj]

Going in, thanks @smoors!