disable w32-ime by using ImmDisableIME()

emacs-24.5-ImmDisableIME.diff

--- ./src/w32fns.c.orig	2015-04-02 16:23:06.000000000 +0900
+++ ./src/w32fns.c	2015-04-25 20:00:47.429173300 +0900
@@ -8664,6 +8664,9 @@
 
   {
     HMODULE imm32_lib = GetModuleHandle ("imm32.dll");
+    BOOL (WINAPI * disable_ime_fn) (DWORD) = (BOOL (WINAPI *) (DWORD))
+      GetProcAddress (imm32_lib, "ImmDisableIME");
+    if (disable_ime_fn) disable_ime_fn (-1);
     get_composition_string_fn = (ImmGetCompositionString_Proc)
       GetProcAddress (imm32_lib, "ImmGetCompositionStringW");
     get_ime_context_fn = (ImmGetContext_Proc)