patch 8.2.2919: using ":!command" does not work if it uses posix_spawn()

Problem:    Using ":!command" does not work if the command uses posix_spawn().
Solution:   Do not call ioctl() with TIOCSCTTY. (Felipe Contreras)
diff --git a/src/os_unix.c b/src/os_unix.c
index 20c6110..0a4f0e6 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -4775,11 +4775,6 @@
 		    // push stream discipline modules
 		    if (options & SHELL_COOKED)
 			setup_slavepty(pty_slave_fd);
-#  ifdef TIOCSCTTY
-		    // Try to become controlling tty (probably doesn't work,
-		    // unless run by root)
-		    ioctl(pty_slave_fd, TIOCSCTTY, (char *)NULL);
-#  endif
 		}
 # endif
 		set_default_child_environment(FALSE);
diff --git a/src/version.c b/src/version.c
index c1fdb64..a9a7b29 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2919,
+/**/
     2918,
 /**/
     2917,