Merge branch 'EB_Hypre' into '2020'

{EasyBlock} Hypre (fix)

See merge request hps-public/easybuild-repository!733

Custom_EasyBlocks/hypre.py

@@ -33,6 +33,7 @@ EasyBuild support for Hypre, implemented as an easyblock
 import os
 
 from easybuild.easyblocks.generic.configuremake import ConfigureMake
+from easybuild.framework.easyconfig import CUSTOM
 from easybuild.tools.build_log import EasyBuildError
 from easybuild.tools.config import build_option
 from easybuild.tools.modules import get_software_root