Add FreeBSD and NetBSD support

[Ev1lT3rm1nal]

Add

--- a/cmake/zig-toolchain.cmake
+++ b/cmake/zig-toolchain.cmake
@@ -36,6 +36,10 @@ elseif(ZIG_OS STREQUAL "wasi")
     set(CMAKE_SYSTEM_NAME "WASI")
 elseif(ZIG_OS STREQUAL "emscripten")
     set(CMAKE_SYSTEM_NAME "Emscripten")
+elseif(ZIG_OS STREQUAL "freebsd")
+    set(CMAKE_SYSTEM_NAME "FreeBSD")
+elseif(ZIG_OS STREQUAL "netbsd")
+    set(CMAKE_SYSTEM_NAME "NetBSD")
 else()
     # NOTE: If this happens, add a new case with one of the following system names:
     # https://cmake.org/cmake/help/latest/variable/CMAKE_SYSTEM_NAME.html#system-names-known-to-cmake

plus: *-freebsd-none.cmake and *-netbsd-(none, eabi, eabihf).cmake

[mrexodia]

Pull requests are welcome! Did you actually test this?

[Ev1lT3rm1nal]

I’ve only tested it on x86_64 FreeBSD and NetBSD in an external project, not using this project’s CMakeLists.txt