1. test for thr_setconcurrency() added to configure

2. wxListCtrl headers always black
3. some warnings in dcpsg.cpp corrected
4. returning FALSE from OnPrintPage() should abort printing now


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4838 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure.in

@@ -2086,6 +2086,8 @@ fi
 
 dnl do other tests only if we are using threads
 if test "$wxUSE_THREADS" = "yes" ; then
+  AC_CHECK_FUNCS(thr_setconcurrency)
+
   dnl define autoconf macro to check for given function in both pthread and
   dnl posix4 libraries
   dnl usage: AC_FUNC_THREAD(FUNCTION_NAME)