Adding in missing functions that were added to 4.x mono

msvc/mono.def

@@ -860,4 +860,6 @@ mono_profiler_create
 mono_unity_install_unitytls_interface
 mono_unity_gc_enable
 mono_unity_gc_disable
-mono_unity_gc_is_disabled
\ No newline at end of file
+mono_unity_gc_is_disabled
+mono_custom_attrs_construct_by_type
+mono_unity_error_convert_to_exception
\ No newline at end of file

unity/unity_utils.c

@@ -362,3 +362,13 @@ int mono_unity_gc_is_disabled()
 	return 0;
 #endif
 }
+
+MonoArray* mono_custom_attrs_construct_by_type(MonoCustomAttrInfo* cinfo, MonoClass* attr_klass, MonoError* error)
+{
+	return mono_custom_attrs_construct(cinfo);
+}
+
+MonoException* mono_unity_error_convert_to_exception(MonoError* error)
+{
+	return NULL;
+}

unity/unity_utils.h

@@ -4,6 +4,8 @@
 #include <stdio.h>
 #include <mono/metadata/object.h>
 #include <mono/metadata/appdomain.h>
+#include <mono/metadata/reflection.h>
+#include <mono/utils/mono-error.h>
 
 /**
  *	Custom exit function, called instead of system exit()
@@ -55,4 +57,7 @@ void mono_unity_gc_enable();
 void mono_unity_gc_disable();
 int mono_unity_gc_is_disabled();
 
+MonoArray* mono_custom_attrs_construct_by_type(MonoCustomAttrInfo* cinfo, MonoClass* attr_klass, MonoError* error);
+MonoException* mono_unity_error_convert_to_exception(MonoError* error);
+
 #endif