windows: remove WINVER check
windows: remove WINVER check

This check is no longer necessary as we require at least Windows XP,
which is 0x0501. It was implemented for ImmGetProperty().

Came in with 011bcd1ea1e8ce10f6b9946d8d44d05a59387b8c

Change-Id: If94d6e99e7f474d931546326bd6c96f2cfa4cfcd

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core