bpo-29643: Fix check for --enable-optimizations (GH-869)

The presence of the ``--enable-optimizations`` flag is indicated by the
value of ``$enableval``, but the configure script was checking ``$withval``,
resulting in the ``--enable-optimizations`` flag being effectively ignored.
(cherry picked from commit 8cea5929f52801b0ce5928b46ef836e99a24321a)

1 files changed, 1 insertions, 1 deletions

diff --git a/configure b/configure
index abe1dc5..8bdb82b 100755
--- a/configure
+++ b/configure
@@ -6521,7 +6521,7 @@ $as_echo_n "checking for --enable-optimizations... " >&6; }
 # Check whether --enable-optimizations was given.
 if test "${enable_optimizations+set}" = set; then :
   enableval=$enable_optimizations;
-if test "$withval" != no
+if test "$enableval" != no
 then
   Py_OPT='true'
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5