Added CMS protobuf patch for text_format and non-virtual-dest (#14)

Author: smuzaffar

third_party/protobuf/protobuf.patch

@@ -138,4 +138,32 @@ index 162531226..e93ec4809 100644
 +  return result;
  }
 
- // If the calling code is not a _pb2.py file, raise AttributeError.
+ // If the calling code is not a _pb2.py file, raise AttributeError.
+diff --git a/python/google/protobuf/text_format.py b/python/google/protobuf/text_format.py
+index a6d8bcf64..24da4cac5 100644
+--- a/python/google/protobuf/text_format.py
++++ b/python/google/protobuf/text_format.py
+@@ -470,9 +470,7 @@ class _Printer(object):
+           entry_submsg = value.GetEntryClass()(key=key, value=value[key])
+           self.PrintField(field, entry_submsg)
+       elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
+-        if (self.use_short_repeated_primitives
+-            and field.cpp_type != descriptor.FieldDescriptor.CPPTYPE_MESSAGE
+-            and field.cpp_type != descriptor.FieldDescriptor.CPPTYPE_STRING):
++        if self.use_short_repeated_primitives:
+           self._PrintShortRepeatedPrimitivesValue(field, value)
+         else:
+           for element in value:
+diff --git a/src/google/protobuf/map_field.h b/src/google/protobuf/map_field.h
+index 287d58f..c243e4a 100644
+--- a/src/google/protobuf/map_field.h
++++ b/src/google/protobuf/map_field.h
+@@ -348,7 +348,7 @@ class PROTOBUF_EXPORT MapFieldBase {
+       : arena_(arena), repeated_field_(nullptr), state_(STATE_MODIFIED_MAP) {}
+ 
+  protected:
+-  ~MapFieldBase() {  // "protected" stops users from deleting a `MapFieldBase *`
++  virtual ~MapFieldBase() {  // "protected" stops users from deleting a `MapFieldBase *`
+     GOOGLE_DCHECK(repeated_field_ == nullptr);
+   }
+   void Destruct();