[IMM32][SDK] Add User32InitializeImmEntryTable to <undocuser.h> (reactos#8006)

Declare function in proper place.
JIRA issue: CORE-19268
- Add User32InitializeImmEntryTable
  prototype to <undocuser.h> and use it.

Author: katahiromz

dll/win32/imm32/imm.c

@@ -1289,8 +1289,6 @@ VOID APIENTRY Imm32UnitTest(VOID)
 }
 #endif
 
-BOOL WINAPI User32InitializeImmEntryTable(DWORD);
-
 BOOL
 WINAPI
 ImmDllInitialize(

sdk/include/reactos/undocuser.h

@@ -204,6 +204,7 @@ HWND WINAPI GetTaskmanWindow(VOID);
 HWND WINAPI GetProgmanWindow(VOID);
 BOOL WINAPI SetShellWindow(HWND);
 BOOL WINAPI SetShellWindowEx(HWND, HWND);
+BOOL WINAPI User32InitializeImmEntryTable(_In_ DWORD);
 
 BOOL WINAPI DrawCaptionTempA(HWND,HDC,const RECT*,HFONT,HICON,LPCSTR,UINT);
 BOOL WINAPI DrawCaptionTempW(HWND,HDC,const RECT*,HFONT,HICON,LPCWSTR,UINT);