os: Minor header cleanup

Move some constants near their only users, and remove some
getdtablesize() logic that's second-guessing configure.

Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Adam Jackson <ajax@redhat.com>

os/connection.c

@@ -873,6 +873,8 @@ EstablishNewConnections(ClientPtr clientUnused, pointer closure)
  *     Fail a connection due to lack of client or file descriptor space
  ************/
 
+#define BOTIMEOUT 200 /* in milliseconds */
+
 static void
 ErrorConnMax(XtransConnInfo trans_conn)
 {

os/io.c

@@ -129,6 +129,8 @@ static OsCommPtr AvailableInput = (OsCommPtr)NULL;
 				  ((xBigReq *)(req))->length)
 
 #define MAX_TIMES_PER         10
+#define BUFSIZE 4096
+#define BUFWATERMARK 8192
 
 /*
  *   A lot of the code in this file manipulates a ConnectionInputPtr:

os/osdep.h

@@ -52,10 +52,6 @@ SOFTWARE.
 #ifndef _OSDEP_H_
 #define _OSDEP_H_ 1
 
-#define BOTIMEOUT 200 /* in milliseconds */
-#define BUFSIZE 4096
-#define BUFWATERMARK 8192
-
 #if defined(XDMCP) || defined(HASXDMAUTH)
 #include <X11/Xdmcp.h>
 #endif