Log Message:
ansilove: update to 4.1.6.

AnsiLove/C 4.1.6 (2021-02-10)

- Mention experimental seccomp support availability in README
- Bump CMake minimum required version to 3.1
- Add SPDX short license identifier in source files
- Add a test case for retina output
- Add a test case for SAUCE output
- Use CMAKE_C_STANDARD instead of hardcoding compiler flags
- Stop linking against libm, it's not necessary anymore