science/libaec: Update to 1.1.6

• Update MASTER_SITES
• Update WWW

Changes: https://github.com/Deutsches-Klimarechenzentrum/libaec/releases

		https://github.com/Deutsches-Klimarechenzentrum/libaec/blob/master/CHANGELOG.md

(cherry picked from commit 997a5a919a7218a4d8064a2fa1e027dd1cca8878)