remove support for missing ANSI C header files (limits.h, stddef.h, etc).

Python/ceval.c

@@ -806,17 +806,6 @@ eval_frame(PyFrameObject *f)
 					goto on_error;
 				}
 			}
-#if !defined(HAVE_SIGNAL_H)
-			/* If we have true signals, the signal handler
-			   will call Py_AddPendingCall() so we don't
-			   have to call PyErr_CheckSignals().  On the 
-			   Mac and DOS, alas, we have to call it. */
-			if (PyErr_CheckSignals()) {
-				why = WHY_EXCEPTION;
-				goto on_error;
-			}
-#endif
-
 #ifdef WITH_THREAD
 			if (interpreter_lock) {
 				/* Give another thread a chance */

Python/pythonrun.c

@@ -13,9 +13,7 @@
 #include "eval.h"
 #include "marshal.h"
 
-#ifdef HAVE_SIGNAL_H
 #include <signal.h>
-#endif
 
 #ifdef HAVE_LANGINFO_H
 #include <locale.h>
@@ -1563,7 +1561,6 @@ Py_Exit(int sts)
 static void
 initsigs(void)
 {
-#ifdef HAVE_SIGNAL_H
 #ifdef SIGPIPE
 	signal(SIGPIPE, SIG_IGN);
 #endif
@@ -1573,7 +1570,6 @@ initsigs(void)
 #ifdef SIGXFSZ
 	signal(SIGXFSZ, SIG_IGN);
 #endif
-#endif /* HAVE_SIGNAL_H */
 	PyOS_InitInterrupts(); /* May imply initsignal() */
 }
 

Python/thread.c

@@ -11,13 +11,7 @@
 #include <stdio.h>
 #endif
 
-#ifdef HAVE_STDLIB_H
 #include <stdlib.h>
-#else
-#ifdef Py_DEBUG
-extern char *getenv(const char *);
-#endif
-#endif
 
 #ifdef __sgi
 #ifndef HAVE_PTHREAD_H /* XXX Need to check in configure.in */