check for cp932 using ::IsValidCodePage before creating the wxCSConv
if it is possible for linux distro or mac to remove the euc_jap cp from install a similar check may be added in WxUtils.cpp
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6928 8ced0084-cf51-0410-be5f-012b33b47a6e