use user's shell instead of hardwired "/bin/sh" (android needs this)

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

miscutils/conspy.c

@@ -316,10 +316,8 @@ static NOINLINE void start_shell_in_child(const char* tty_name)
 	int pid = xvfork();
 	if (pid == 0) {
 		struct termios termchild;
-		char *shell = getenv("SHELL");
+		const char *shell = get_shell_name();
 
-		if (!shell)
-			shell = (char *) DEFAULT_SHELL;
 		signal(SIGHUP, SIG_IGN);
 		// set tty as a controlling tty
 		setsid();