Sanitizers on FreeBSD

[ngortheone]

Today Odin does not support memory sanitizers on FreeBSD. An attempt to build with sanitizers enabled gives the following errors:

odin run main.odin -file -sanitize:memory                          
-sanitize:memory is only supported on linux 

odin run main.odin -file -sanitize:address                          
-sanitize:address is only supported on windows, linux, and darwin  

Generally clang/llvm supports sanitizers on FreeBSD and I can use them with C/C++ code so this has to be a limitation within Odin compiler.

Rationale: Why do I request this? As a human being I am prone to making stupid mistakes and create footguns. I can't trust myself to write bug-free. Tacking memory allocator is great and it helps, but certain classes of problems like use-after-free are not caught by it. I need something to give me more assurance before I can ship Odin code to production.

[laytan]

Try adding freebsd to this switch statement, if it works, you can make a pr to add it permanently, or just comment and I'll do it.

https://github.com/odin-lang/Odin/blob/397e37123231087a1c6d4f5b68f9f6af0be1734b/src/build_settings.cpp#L2085:L2095