1. attempts to fix vsnprintf() check
2. use AC_TRY_COMPILE(), not RUN() for vscanf() check 3. don't test for joystick support in !wxUSE_GUI git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@6983 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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