Fix build with MRuby 2.0.0

array.go

@@ -1,6 +1,7 @@
 package mruby
 
 // #include "gomruby.h"
+// mrb_int _mrb_ary_len(mrb_value ary) { return RARRAY_LEN(ary); }
 import "C"
 
 // Array represents an MrbValue that is a Array in Ruby.
@@ -12,7 +13,7 @@ type Array struct {
 
 // Len returns the length of the array.
 func (v *Array) Len() int {
-	return int(C.mrb_ary_len(v.state, v.value))
+	return int(C._mrb_ary_len(v.value))
 }
 
 // Get gets an element form the Array by index.

func.go

@@ -63,7 +63,7 @@ func goMRBFuncCall(s *C.mrb_state, v C.mrb_value) C.mrb_value {
 
 	// Lookup the class itself
 	classTable.Mutex.Lock()
-	methodTable := classTable.Map[ci.proc.target_class]
+	methodTable := classTable.Map[ci.target_class]
 	classTable.Mutex.Unlock()
 	if methodTable == nil {
 		panic(fmt.Sprintf("func call on unknown class"))

value.go

@@ -139,7 +139,7 @@ func (v *MrbValue) GCProtect() {
 // when this value is a proc.
 func (v *MrbValue) SetProcTargetClass(c *Class) {
 	proc := C._go_mrb_proc_ptr(v.value)
-	proc.target_class = c.class
+	proc.e = *(*[8]byte)(unsafe.Pointer(&c.class))
 }
 
 // Type returns the ValueType of the MrbValue. See the constants table.