[lldb][NFC] Remove plugin headers from Module (llvm#167789)

As of e4a672b, lldbCore is free of plugins. These headers are no
longer needed.

Author: bulbazord

lldb/source/Core/Module.cpp

@@ -52,9 +52,6 @@
 #include "lldb/Host/windows/PosixApi.h"
 #endif
 
-#include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
-#include "Plugins/Language/ObjC/ObjCLanguage.h"
-
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/DJB.h"