expect: fix build with clang 16

* Use patches from upstream issue tracker that fix most compilation
  issues and the configure script; and
* Modify `exp_win.c` and `pty_termios.c` to build properly on Darwin.

pkgs/tools/misc/expect/default.nix

@@ -6,18 +6,29 @@ tcl.mkTclDerivation rec {
 
   src = fetchurl {
     url = "mirror://sourceforge/expect/Expect/${version}/expect${version}.tar.gz";
-    sha256 = "0d1cp5hggjl93xwc8h1y6adbnrvpkk0ywkd00inz9ndxn21xm9s9";
+    hash = "sha256-Safag7C92fRtBKBN7sGcd2e7mjI+QMR4H4nK92C5LDQ=";
   };
 
   patches = [
     (fetchpatch {
       url = "https://raw.githubusercontent.com/buildroot/buildroot/c05e6aa361a4049eabd8b21eb64a34899ef83fc7/package/expect/0001-enable-cross-compilation.patch";
-      sha256 = "1jwx2l1slidvcpahxbyqs942l81jd62rzbxliyd9lwysk38c8b6b";
+      hash = "sha256-yyzE0Jjac5qaj7Svn4VpMiAqSNLYrw7VZbtFqgMVncs=";
     })
     (substituteAll {
       src = ./fix-cross-compilation.patch;
       tcl = "${buildPackages.tcl}/bin/tclsh";
     })
+    # The following patches fix compilation with clang 15+
+    (fetchpatch {
+      url = "https://sourceforge.net/p/expect/patches/24/attachment/0001-Add-prototype-to-function-definitions.patch";
+      hash = "sha256-X2Vv6VVM3KjmBHo2ukVWe5YTVXRmqe//Kw2kr73OpZs=";
+    })
+    (fetchpatch {
+      url = "https://sourceforge.net/p/expect/patches/_discuss/thread/b813ca9895/6759/attachment/expect-configure-c99.patch";
+      hash = "sha256-PxQQ9roWgVXUoCMxkXEgu+it26ES/JuzHF6oML/nk54=";
+    })
+    # Include `sys/ioctl.h` and `util.h` on Darwin, which are required for `ioctl` and `openpty`.
+    ./fix-darwin-clang16.patch
   ];
 
   postPatch = ''

pkgs/tools/misc/expect/fix-darwin-clang16.patch

@@ -0,0 +1,31 @@
+diff -ur a/exp_win.c b/exp_win.c
+--- a/exp_win.c	2018-02-02 14:15:52.000000000 -0500
++++ b/exp_win.c	2023-10-10 07:47:33.082690432 -0400
+@@ -39,7 +39,8 @@
+ /* Sigh.  On AIX 2.3, termios.h exists but does not define TIOCGWINSZ */
+ /* Instead, it has to come from ioctl.h.  However, As I said above, this */
+ /* can't be cavalierly included on all machines, even when it exists. */
+-#if defined(HAVE_TERMIOS) && !defined(HAVE_TIOCGWINSZ_IN_TERMIOS_H)
++/* Darwin also has termios.h, but it requires ioctl.h for `ioctl`. */
++#if defined(HAVE_TERMIOS) && (defined(__APPLE__) || !defined(HAVE_TIOCGWINSZ_IN_TERMIOS_H))
+ #  include <sys/ioctl.h>
+ #endif
+
+diff -ur d/pty_termios.c c/pty_termios.c
+--- d/pty_termios.c	2023-10-10 07:59:23.244452442 -0400
++++ c/pty_termios.c	2023-10-10 08:00:35.303231582 -0400
+@@ -7,7 +7,13 @@
+
+ */
+
+-#include <pty.h> /* openpty */
++/* openpty */
++#ifdef __APPLE__
++#include <util.h>
++#else /* pty.h is Linux-specific */
++#include <pty.h>
++#endif
++
+ #include <stdio.h>
+ #include <signal.h>
+