disable building of manpages for GDCM to fix installation problem with docbook

[boegel]

(created using eb --new-pr)
fix for:

warning: failed to load external entity http://docbook.sourceforge.net/release/xsl-ns/current/manpages/pi.xsl                                                                                                                                                                 compilation error: file http://docbook.sourceforge.net/release/xsl-ns/current/manpages/docbook.xsl line 42 element include                                                                                                                                                      xsl:include : unable to load http://docbook.sourceforge.net/release/xsl-ns/current/manpages/pi.xsl                                                                                                                                                                              compilation error: file /tmp/vsc40023/easybuild_build/GDCM/3.0.5/GCCcore-8.3.0/easybuild_obj/Utilities/doxygen/gdcm2pnm.xml line 4 element refentry                                                                                                                             xsltParseStylesheetProcess : document is not a styleshee

[boegel]

@boegelbot please test @ generoso
EB_ARGS="GDCM-2.8.9-GCCcore-7.3.0.eb GDCM-3.0.4-GCCcore-8.2.0.eb GDCM-3.0.5-GCCcore-8.3.0.eb"

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 4 out of 4 (4 easyconfigs in total)
node3129.skitty.os - Linux centos linux 7.9.2009, x86_64, Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz, Python 3.6.8
See https://gist.github.com/377100d4176eb3c1216bd25d8469446f for a full test report.

[boegelbot]

@boegel: Request for testing this PR well received on generoso

PR test command 'EB_PR=11866 EB_ARGS="DCM-2.8.9-GCCcore-7.3.0.eb GDCM-3.0.4-GCCcore-8.2.0.eb GDCM-3.0.5-GCCcore-8.3.0.eb" /apps/slurm/default/bin/sbatch --job-name test_PR_11866 --ntasks=4 ~/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 12276

Test results coming soon (I hope)...

- notification for comment with ID 743338467 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).

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 4 out of 4 (4 easyconfigs in total)
node2707.swalot.os - Linux centos linux 7.9.2009, x86_64, Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz (haswell), Python 3.6.8
See https://gist.github.com/0e4b495b146fd7eaeca4152c9c068514 for a full test report.

[verdurin]

Test report by @verdurin
SUCCESS
Build succeeded for 1 out of 1 (4 easyconfigs in total)
easybuild-c7.novalocal - Linux centos linux 7.9.2009, x86_64, Intel Xeon Processor (Skylake, IBRS), Python 3.6.8
See https://gist.github.com/92f474dedf0fb0244431186d3a324576 for a full test report.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 4 out of 4 (4 easyconfigs in total)
node3409.kirlia.os - Linux centos linux 7.9.2009, x86_64, Intel(R) Xeon(R) Gold 6240 CPU @ 2.60GHz (cascadelake), Python 3.6.8
See https://gist.github.com/c333ef1fdfb66ada36801af607e14517 for a full test report.

[zao]

Test report by @zao
SUCCESS
Build succeeded for 4 out of 4 (4 easyconfigs in total)
eb-u1604 - Linux ubuntu 16.04, x86_64, Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz, Python 2.7.12
See https://gist.github.com/412134f8bd79aa3d477d0c7045348758 for a full test report.

[Micket]

lgtm (so many builds but no review!)

[Micket]

Going in, thanks @boegel!