- don't include plugin.h in bochs.h to reduce dependencies

bochs/bochs.h

@@ -463,7 +463,6 @@ BOCHSAPI extern Bit32u apic_id_mask;
 
 #include "memory/memory.h"
 #include "pc_system.h"
-#include "plugin.h"
 #include "gui/gui.h"
 
 /* --- EXTERNS --- */

bochs/gui/nogui.cc

@@ -25,6 +25,7 @@
 #define BX_PLUGGABLE
 
 #include "bochs.h"
+#include "plugin.h"
 #include "param_names.h"
 
 #if BX_WITH_NOGUI

bochs/iodev/iodev.h

@@ -26,6 +26,7 @@
 #define IODEV_H
 
 #include "bochs.h"
+#include "plugin.h"
 #include "param_names.h"
 
 /* number of IRQ lines supported.  In an ISA PC there are two