Fix breakage from patch 1471883 (r45800 & r45808) on OSF/1.

The problem was that pyconfig.h was being included before some system headers
which caused redefinitions and other breakage.  This moves system headers
after expat_config.h which includes pyconfig.h.

Modules/expat/xmlparse.c

@@ -2,10 +2,6 @@
    See the file COPYING for copying permission.
 */
 
-#include <stddef.h>
-#include <string.h>                     /* memset(), memcpy() */
-#include <assert.h>
-
 #define XML_BUILDING_EXPAT 1
 
 #ifdef COMPILED_FROM_DSP
@@ -16,6 +12,10 @@
 #include <expat_config.h>
 #endif /* ndef COMPILED_FROM_DSP */
 
+#include <stddef.h>
+#include <string.h>                     /* memset(), memcpy() */
+#include <assert.h>
+
 #include "expat.h"
 
 #ifdef XML_UNICODE

Modules/expat/xmlrole.c

@@ -2,8 +2,6 @@
    See the file COPYING for copying permission.
 */
 
-#include <stddef.h>
-
 #ifdef COMPILED_FROM_DSP
 #include "winconfig.h"
 #elif defined(MACOS_CLASSIC)
@@ -14,6 +12,8 @@
 #endif
 #endif /* ndef COMPILED_FROM_DSP */
 
+#include <stddef.h>
+
 #include "expat_external.h"
 #include "internal.h"
 #include "xmlrole.h"

Modules/expat/xmltok.c

@@ -2,8 +2,6 @@
    See the file COPYING for copying permission.
 */
 
-#include <stddef.h>
-
 #ifdef COMPILED_FROM_DSP
 #include "winconfig.h"
 #elif defined(MACOS_CLASSIC)
@@ -14,6 +12,8 @@
 #endif
 #endif /* ndef COMPILED_FROM_DSP */
 
+#include <stddef.h>
+
 #include "expat_external.h"
 #include "internal.h"
 #include "xmltok.h"