ptlib: fix build with glibc 2.26

Tracking issue: #31696

pkgs/development/libraries/ptlib/default.nix

···
     (fetchpatch { url = http://sources.debian.net/data/main/p/ptlib/2.10.11~dfsg-2.1/debian/patches/gcc-5_support;
       sha256 = "0pf2yj0150r4cnc6nv65mclrm3dillqh1xjk7m6gsjnk9b96i5d4";
     })
+    ./ptlib-2.10.11-glibc-2.26.patch
   ];
 
   meta = with stdenv.lib; {
···
     };
   };
 }
-

pkgs/development/libraries/ptlib/ptlib-2.10.11-glibc-2.26.patch

···
+diff --git a/src/ptlib/unix/channel.cxx b/src/ptlib/unix/channel.cxx
+index 3b17dda..2dcaa18 100644
+--- a/src/ptlib/unix/channel.cxx
++++ b/src/ptlib/unix/channel.cxx
+@@ -36,7 +36,7 @@
+ 
+ #include <ptlib.h>
+ #include <sys/ioctl.h>
+-
++#include <sys/uio.h>
+ 
+ #include "../common/pchannel.cxx"
+