os2: initial implementation for Darwin&BSDs, process API is only thing incomplete

core/sys/unix/sysctl_darwin.odin

@@ -67,6 +67,8 @@ CTL_KERN    :: 1
 	KERN_VERSION   :: 4  // Darwin Kernel Version 21.5.0: Tue Apr 26 21:08:22 PDT 2022; root:darwin-8020.121.3~4/RELEASE_X86_64
 	KERN_OSRELDATE :: 26 // i32: OS release date
 	KERN_OSVERSION :: 65 // Build number, e.g. 21F79
+	KERN_PROCARGS  :: 38
+	KERN_PROCARGS2 :: 49
 CTL_VM      :: 2
 CTL_VFS     :: 3
 CTL_NET     :: 4
@@ -82,4 +84,4 @@ CTL_HW      :: 6
 	HW_AVAILCPU     :: 25 /* int: number of available CPUs */
 
 CTL_MACHDEP :: 7
-CTL_USER    :: 8
+CTL_USER    :: 8

core/sys/unix/sysctl_freebsd.odin

@@ -23,6 +23,8 @@ CTL_KERN   :: 1
 	KERN_OSRELEASE :: 2
 	KERN_OSREV     :: 3
 	KERN_VERSION   :: 4
+	KERN_PROC      :: 14
+		KERN_PROC_PATHNAME :: 12
 CTL_VM     :: 2
 CTL_VFS    :: 3
 CTL_NET    :: 4