Check where select() is defined during configure time


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@3165 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/configure.ac b/common/configure.ac
index b895da6..fc2f8bf 100644
--- a/common/configure.ac
+++ b/common/configure.ac
@@ -84,6 +84,8 @@
 	[AC_DEFINE([VNC_SOCKLEN_T], [socklen_t], [Use correct size])],
 	[AC_DEFINE([VNC_SOCKLEN_T], [int])])
 
+AC_CHECK_HEADERS([sys/select.h])
+
 AC_OUTPUT([Makefile
 	   rdr/Makefile
 	   network/Makefile