Closed issue by atweiden on void-packages repository

https://github.com/void-linux/void-packages/issues/32266

Description:
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### System

* xuname:
  * Void 5.12.19_1 x86_64 GenuineIntel notuptodate rrmFFF
* package:
  * cryfs-0.10.2_2

### Expected behavior

cryfs package provides release build of the `cryfs` program

### Actual behavior

cryfs package provides debug build of the `cryfs` program

### Steps to reproduce the behavior

See: https://github.com/void-linux/void-packages/commit/203bdffbe1b81fcef08d6cb52517b67ecb7596b6

Setting `CMAKE_BUILD_TYPE=None` seems to result in a debug build being produced, which adversely impacts performance of the resulting program.