The past few commits mean we no longer need to do reverse sysData lookup, so get rid of that.

sysdatacache_windows.go

@@ -1,46 +0,0 @@
-// 11 february 2014
-package main
-
-import (
-	"fmt"
-	"sync"
-)
-
-// I need a way to get a sysData for a given HWND or a given HWND/control ID. So, this.
-
-var (
-	sysDatas = map[_HWND]*sysData{}
-	sysDatasLock sync.Mutex
-	sysDataIDs = map[_HMENU]*sysData{}
-	sysDataIDsLock sync.Mutex
-)
-
-func addSysData(hwnd _HWND, s *sysData) {
-	sysDatasLock.Lock()
-	defer sysDatasLock.Unlock()
-	sysDatas[hwnd] = s
-}
-
-func addSysDataID(id _HMENU, s *sysData) {
-	sysDataIDsLock.Lock()
-	defer sysDataIDsLock.Unlock()
-	sysDataIDs[id] = s
-}
-
-func getSysData(hwnd _HWND) *sysData {
-	sysDatasLock.Lock()
-	defer sysDatasLock.Unlock()
-	if ss, ok := sysDatas[hwnd]; ok {
-		return ss
-	}
-	return nil
-}
-
-func getSysDataID(id _HMENU) *sysData {
-	sysDataIDsLock.Lock()
-	defer sysDataIDsLock.Unlock()
-	if ss, ok := sysDataIDs[id]; ok {
-		return ss
-	}
-	panic(fmt.Sprintf("getting nonexistent ID %d\n", id))
-}