MNT: always require va_start to have two arguments (#4820)

* MNT: always require va_start to have two arguments

https://github.com/python/cpython/pull/93215 chance CPython to always use the
2-input version of va_start and dropped defining HAVE_STDARG_PROTOTYPES.  This
resulted in the 1-argument version being used when compiling cython source
which fails

This makes cython also always use the 2-argument version.

* Remove blank line

* FIX: version gate 2-argument va_start checking to py311

Cython/Utility/MemoryView_C.c

@@ -450,7 +450,7 @@ static void __pyx_fatalerror(const char *fmt, ...) Py_NO_RETURN {
     va_list vargs;
     char msg[200];
 
-#ifdef HAVE_STDARG_PROTOTYPES
+#if PY_VERSION_HEX >= 0x030A0000 || defined(HAVE_STDARG_PROTOTYPES)
     va_start(vargs, fmt);
 #else
     va_start(vargs);