Remove leftovers from the times when long long wasn't required (GH-15501)

In a38e9d13 pyconfig.h.in was
manually edited and that edit was overwritten when running autoreconf.

configure.ac

@@ -2313,7 +2313,7 @@ if test "$ac_cv_sizeof_off_t" -gt "$ac_cv_sizeof_long" -a \
 	"$ac_cv_sizeof_long_long" -ge "$ac_cv_sizeof_off_t"; then
   AC_DEFINE(HAVE_LARGEFILE_SUPPORT, 1,
   [Defined to enable large file support when an off_t is bigger than a long
-   and long long is available and at least as big as an off_t. You may need
+   and long long is at least as big as an off_t. You may need
    to add some flags for configuration and compilation to enable this mode.
    (For Solaris and Linux, the necessary defines are already defined.)])
   AC_MSG_RESULT(yes)

pyconfig.h.in

@@ -569,9 +569,9 @@
 #undef HAVE_LANGINFO_H
 
 /* Defined to enable large file support when an off_t is bigger than a long
-   and long long is at least as big as an off_t. You may need to
-   add some flags for configuration and compilation to enable this mode. (For
-   Solaris and Linux, the necessary defines are already defined.) */
+   and long long is at least as big as an off_t. You may need to add some
+   flags for configuration and compilation to enable this mode. (For Solaris
+   and Linux, the necessary defines are already defined.) */
 #undef HAVE_LARGEFILE_SUPPORT
 
 /* Define to 1 if you have the 'lchflags' function. */