Remove support of plug-in mechanism.

This API is obsolete and can be fully replaced with existing `api.h`.

JerryScript-DCO-1.0-Signed-off-by: Evgeny Gavrin e.gavrin@samsung.com

main-linux.cpp

@@ -19,8 +19,6 @@
 #include "jerry.h"
 #include "jrt/jrt.h"
 
-#include "plugins/io/init.h"
-
 /**
  * Maximum command line arguments number
  */
@@ -236,8 +234,6 @@ main (int argc,
 
       jerry_init (flags);
 
-      plugin_io_init ();
-
       jerry_completion_code_t ret_code = JERRY_COMPLETION_CODE_OK;
 
       if (!jerry_parse (source_p, source_size))