GraphicsMagick: add include/GraphicsMagick to CPATH as that is the in…

[bartoldeman]

…clude path.

[hpcugentbot]

Automatic reply from Jenkins: Can I test this?

[boegel]

Jenkins: ok to test

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 3 out of 3 (3 easyconfigs in this PR)
node2159.delcatty.os - Linux SL 6.7, Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz, Python 2.6.6
See https://gist.github.com/ab7e300df6f1f71a8aea066dacfd3337 for a full test report.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 3 out of 3 (3 easyconfigs in this PR)
node2565.golett.os - Linux centos linux 7.2.1511, Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz, Python 2.7.5
See https://gist.github.com/812964c9f02360016f0e22771d777fe5 for a full test report.

[boegel]

lgtm

[hpcugentbot]

Easyconfigs unit test suite PASSed (see https://jenkins1.ugent.be/job/easybuild-easyconfigs-pr-builder/7964/console for more details).

This pull request is now ready for review/testing.

Please try and find someone who can tackle this; contact @boegel if you're not sure what to do.

[boegel]

going in, thanks @bartoldeman!