Drop cmake anti-pattern

This removes an anti-pattern from CMakeLists.txt (I'm very sorry for introducing it). The most annoying part about it is that it makes it difficult for a parent project (e.g. ICON) to support multi-configuration backends properly. Basically, the only right place to set CMAKE_BUILD_TYPE is on the command line when calling cmake (and generating for a single-configuration backend). Also, see here.

requested review from @b382190

added 5 commits

• b3d35005...f7de0957 - 3 commits from branch master
• c58dde49 - Do not override/set CMAKE_BUILD_TYPE in CMakeLists.txt
• 8be443f8 - Set CMAKE_BUILD_TYPE in CI scripts

Compare with previous version

LGTM!

approved this merge request

merged

mentioned in commit f25f06bc

mentioned in merge request libiconmath!17 (merged)

mentioned in commit libiconmath@d301e774