Change OpenAL include statement to be what CMake docs suggest

Also WIP QEMU-like monitor.

src/sound/openal.c

@@ -26,9 +26,9 @@
 # undef ALC_API
 # define AL_LIBTYPE_STATIC
 # define ALC_LIBTYPE_STATIC
-# include <al.h>
-# include <alc.h>
-# include <alext.h>
+# include "al.h"
+# include "alc.h"
+# include "alext.h"
 #include <86box/86box.h>
 #include <86box/sound.h>
 #include <86box/midi.h>

src/unix/unix.c

@@ -574,6 +574,16 @@ void mouse_poll()
 extern int real_sdl_w, real_sdl_h;
 static int exit_event = 0;
 void ui_sb_set_ready(int ready) {}
+
+void monitor_thread(void* param)
+{
+    if (isatty(fileno(stdin)) && isatty(fileno(stdout)))
+    {
+        printf("86Box monitor console.\n");
+        
+    }
+}
+
 int main(int argc, char** argv)
 {
     SDL_Event event;