bpo-45723: Remove obsolete AC_EXEEXT from configure.ac (GH-29486)

From the autoconf docs *Obsolete Macros* section:

    Defined the output variable EXEEXT based on the output of the 
    compiler, which is now done automatically. Typically set to empty
    string if Posix and ‘.exe’ if a DOS variant.

1 files changed, 0 insertions, 1 deletions

diff --git a/configure b/configure
index 76d9c49..45ac189 100755
--- a/configure
+++ b/configure
@@ -5738,7 +5738,6 @@ atheos*|Linux*/1*)
    exit 1;;
 esac
 
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-suffix" >&5
 $as_echo_n "checking for --with-suffix... " >&6; }