Fix typo in configure.in, and propagate configure.in changes from r64002

to configure and pyconfig.h.in.

configure.in

@@ -1328,7 +1328,7 @@ AC_TRY_COMPILE([], [long double x; x = (long double)0.;], [
   have_long_double=yes
 ])
 AC_MSG_RESULT($have_long_double)
-if test "$have_long_long" = yes ; then
+if test "$have_long_double" = yes ; then
 AC_CHECK_SIZEOF(long double, 12)
 fi
 

pyconfig.h.in

@@ -384,6 +384,9 @@
 /* Define to 1 if you have the `log1p' function. */
 #undef HAVE_LOG1P
 
+/* Define this if you have the type long double. */
+#undef HAVE_LONG_DOUBLE
+
 /* Define this if you have the type long long. */
 #undef HAVE_LONG_LONG
 
@@ -887,6 +890,9 @@
 /* The size of `long', as computed by sizeof. */
 #undef SIZEOF_LONG
 
+/* The size of `long double', as computed by sizeof. */
+#undef SIZEOF_LONG_DOUBLE
+
 /* The size of `long long', as computed by sizeof. */
 #undef SIZEOF_LONG_LONG