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


In a38e9d139929a227e3899fbb638bc46c6cc6d8ba pyconfig.h.in was
manually edited and that edit was overwritten when running autoreconf.
(cherry picked from commit 52c1a6a15a471f75b775309ed1120d05f69010ca)

Co-authored-by: Sergey Fedoseev <fedoseev.sergey@gmail.com>
diff --git a/configure.ac b/configure.ac
index a208889..033a93c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2313,7 +2313,7 @@
 	"$ac_cv_sizeof_long_long" -ge "$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)