[core:thread] Seeing if this fixes network tests

core/thread/thread_windows.odin

@@ -6,17 +6,10 @@ import "core:intrinsics"
 import "core:sync"
 import win32 "core:sys/windows"
 
-Thread_State :: enum u8 {
-	Started,
-	Joined,
-	Done,
-}
-
 Thread_Os_Specific :: struct {
 	win32_thread:    win32.HANDLE,
 	win32_thread_id: win32.DWORD,
 	mutex:           sync.Mutex,
-	flags:           bit_set[Thread_State; u8],
 }
 
 _thread_priority_map := [Thread_Priority]i32{
@@ -47,7 +40,7 @@ _create :: proc(procedure: Thread_Proc, priority: Thread_Priority) -> ^Thread {
 
 		intrinsics.atomic_store(&t.flags, t.flags + {.Done})
 
-		if t.self_cleanup {
+		if .Self_Cleanup in t.flags {
 			win32.CloseHandle(t.win32_thread)
 			t.win32_thread = win32.INVALID_HANDLE
 			// NOTE(ftphikari): It doesn't matter which context 'free' received, right?