Print the backtrace before showing the signal handler popup.

src/sdl/i_system.c

@@ -363,10 +363,8 @@ FUNCNORETURN static ATTRNORETURN void signal_handler(INT32 num)
 {
 	D_QuitNetGame(); // Fix server freezes
 	CL_AbortDownloadResume();
-	I_ReportSignal(num, 0);
-
 	write_backtrace(num);
-
+	I_ReportSignal(num, 0);
 	I_ShutdownSystem();
 	signal(num, SIG_DFL);               //default signal action
 	raise(num);