hooklib: Allow proper passthrough of serial calls to real hardware (#26)

Only enabled / tested on IIDX CB and SDVX5

The point of this, is to allow rs232 hooks for only the descriptors that we hook.
This is because the emulation here is incomplete.
Although the IOCTL's do end up being passed to the real hardware, the game rejects some of the responses and hangs.
By short circuiting out, and calling the real Comm functions instead, it works.
And hence, card-reader passthrough works on IIDX25+/SDVX5+ finally without eamio-real

src/main/iidxhook8/bio2.c

@@ -13,6 +13,7 @@
 #include "acioemu/emu.h"
 
 #include "hook/iohook.h"
+#include "hooklib/rs232.h"
 
 #include "iidxhook8/bi2a.h"
 
@@ -31,6 +32,8 @@ void bio2_port_init(bool disable_poll_limiter)
     // they use the same framing
     ac_io_emu_init(&bio2_emu, L"COM4");
     bio2_emu_bi2a_init(&bio2_emu, disable_poll_limiter);
+
+    rs232_hook_add_fd(bio2_emu.fd);
 }
 
 void bio2_port_fini(void)

src/main/iidxhook8/dllmain.c

@@ -126,6 +126,7 @@ static bool my_dll_entry_init(char *sidcode, struct property_node *param)
        API implementations with real IO devices */
     iohook_init(iidxhook_handlers, lengthof(iidxhook_handlers));
     rs232_hook_init();
+    rs232_hook_limit_hooks();
 
     if (!iidxhook8_config_io.disable_bio2_emu) {
         bio2_port_init(iidxhook8_config_io.disable_poll_limiter);