compilation fixes for wxUSE_WCHAR_T==0 (this is the case for DJGPP which is used for wxMGL compilation)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@45893 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/chkconf.h

@@ -1197,6 +1197,18 @@
 #   endif
 #endif /* wxUSE_ZIPSTREAM */
 
+#if wxUSE_TARSTREAM
+    /* wxTar doesn't currently compile without wchar_t */
+#   if !wxUSE_WCHAR_T
+#       ifdef wxABORT_ON_CONFIG_ERROR
+#           error "wxTar requires wchar_t"
+#       else
+#           undef wxUSE_TARSTREAM
+#           define wxUSE_TARSTREAM 0
+#       endif
+#   endif
+#endif /* wxUSE_TARSTREAM */
+
 #if wxUSE_TARSTREAM
 #   if !wxUSE_ARCHIVE_STREAMS
 #       ifdef wxABORT_ON_CONFIG_ERROR