ansilove: update to 4.1.2.

AnsiLove/C 4.1.2 (2020-07-04)

- Define _GNU_SOURCE in CMakeLists.txt to avoid cluttering source files
- No need to set HAVE_SECCOMP to 1, defining it is enough
- Remove some unneeded seccomp related includes
- Validate architectures for seccomp
- Add seccomp support on i386, tested on glibc and musl
- Remove extraneous underscore in #if defined check
- Use __NR_ instead of SYS_ prefix in #if defined checks

(fcambus)