tinyx: fix SIGINT handling in st and xserver

Pressing ^C in X session is now captured by client apps instead of
killing the X server. Pressing ^C in st sends SIGINT to the process
inside pty instead of doing nothing.

JIRA: RTOS-861, RTOS-889

tinyx/patches/st/0.2/04-tiocstty.patch

@@ -0,0 +1,12 @@
+diff -ruN a/st.c b/st.c
+--- a/st.c	2024-09-02 10:01:36.967676919 +0200
++++ b/st.c	2024-09-02 11:46:12.263350519 +0200
+@@ -708,6 +709,8 @@
+ 		dup2(s, STDIN_FILENO);
+ 		dup2(s, STDOUT_FILENO);
+ 		dup2(s, STDERR_FILENO);
++    if(ioctl(s, TIOCSCTTY, NULL) < 0)
++      die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
+ 		close(s);
+ 		close(m);
+ 		execsh();

tinyx/patches/tinyx/eed490/13-tiocnotty.patch

@@ -0,0 +1,29 @@
+diff -ruN a/kdrive/phoenix/phoenix.c b/kdrive/phoenix/phoenix.c
+--- a/kdrive/phoenix/phoenix.c	2024-09-02 10:24:29.020264244 +0200
++++ b/kdrive/phoenix/phoenix.c	2024-09-02 11:36:26.806165111 +0200
+@@ -4,6 +4,7 @@
+ #include "kdrive.h"
+ #include <errno.h>
+ #include <signal.h>
++#include <termios.h>
+ #include <sys/stat.h>
+ #include <sys/ioctl.h>
+ #include <X11/keysym.h>
+@@ -14,6 +15,17 @@
+
+ static int PhoenixInit(void)
+ {
++  int fd;
++  if ((fd = open("/dev/tty0", O_WRONLY, 0)) < 0) {
++    FatalError("PhoenixInit: Cannot open /dev/tty0 (%s)\n",
++         strerror(errno));
++  }
++
++	if (ioctl(fd, TIOCNOTTY, NULL) < 0) {
++		FatalError("PhoenixInit: TIOCNOTTY failed\n");
++	}
++  close(fd);
++
+ 	return 1;
+ }
+