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

Include/Python.h

@@ -15,11 +15,7 @@
 #define WITH_CYCLE_GC 1
 #endif
 
-#ifdef HAVE_LIMITS_H
 #include <limits.h>
-#else
-#error "limits.h is required by std C -- why isn't HAVE_LIMITS_H defined?"
-#endif
 
 #ifndef UCHAR_MAX
 #error "Something's broken.  UCHAR_MAX should be defined in limits.h."
@@ -40,9 +36,7 @@
 
 #include <string.h>
 #include <errno.h>
-#ifdef HAVE_STDLIB_H
 #include <stdlib.h>
-#endif
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif

Include/pyport.h

@@ -85,9 +85,7 @@ typedef PY_LONG_LONG		Py_intptr_t;
 #   error "Python needs a typedef for Py_uintptr_t in pyport.h."
 #endif /* HAVE_UINTPTR_T */
 
-#ifdef HAVE_STDLIB_H
 #include <stdlib.h>
-#endif
 
 #include <math.h> /* Moved here from the math section, before extern "C" */
 

Include/structmember.h

@@ -7,9 +7,7 @@ extern "C" {
 
 /* Interface to map C struct members to Python object attributes */
 
-#ifdef HAVE_STDDEF_H
 #include <stddef.h> /* For offsetof */
-#endif
 
 /* The offsetof() macro calculates the offset of a structure member
    in its structure.  Unfortunately this cannot be written down