fix broken tarball links for ispc 1.6, 1.10, and 1.12 easyconfigs

[LukeLabrie]

No description provided.

[Micket]

lgtm

[Micket]

Test report by @Micket
SUCCESS
Build succeeded for 3 out of 3 (3 easyconfigs in total)
vera-c1 - Linux Rocky Linux 8.7, x86_64, Intel Xeon Processor (Skylake), Python 3.6.8
See https://gist.github.com/Micket/05a3ede9a7ac8bf9893877c1b704b879 for a full test report.

[Micket]

@boegelbot please test @ generoso

[boegelbot]

@Micket: Request for testing this PR well received on login1

PR test command 'EB_PR=17875 EB_ARGS= EB_CONTAINER= /opt/software/slurm/bin/sbatch --job-name test_PR_17875 --ntasks=4 ~/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 10761

Test results coming soon (I hope)...

- notification for comment with ID 1538854405 processed

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).

[boegelbot]

Test report by @boegelbot
SUCCESS
Build succeeded for 3 out of 3 (3 easyconfigs in total)
cns2 - Linux Rocky Linux 8.5, x86_64, Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz (haswell), Python 3.6.8
See https://gist.github.com/boegelbot/e980d9eacab502c3cd933e5291121df6 for a full test report.