Merge pull request #477 from boegel/v1.15.x

bump version to v1.15.1 and update release notes
only disable sanitizer tests for recent Clang versions
fix version check
add check whether file exists before patching it
bump version to v1.15.2dev
Merge branch 'v1.15.x' of github.com:hpcugent/easybuild-easyblocks into v1.15.x
pass down installopts to CUDA install command
bump to v1.15.2 and update release notes
Merge pull request #484 from boegel/v1.15.2

bump to v1.15.2 and update release notes
Merge branch 'v1.15.x'