user32: Use the PostMessage() for WM_IME_KEY{DOWN|UP} message

[ByeongSik Jeon]

 * MS Spi++ test result, PostMessage is right.
 * Message generation sequence:
   WM_IME_KEYDOWN -> WM_KEYDOWN -> WM_CHAR
   WM_CHAR is genetated in the TranslateMessage() when we use
   PostMessage() function.
 * Real case: MS IME 2002, MS IME 2003, Saenaru
   In the preedit mode, when we press the "ENTER" key, Korean
   Native IME generate the WM_IME_KEYDOWN(wParam==VK_RETURN) message.
   This message is translated to the WM_CHAR(wParam==VK_RETURN)
   message finally.

---
 dlls/user32/defwnd.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)
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