SocksProxy: inline one-line definitions

Merge one-line definitions with declarations in the header file.

src/client/proxy/socks.cc

@@ -610,15 +610,5 @@ void SOCKSDNSAddress::FromString(std::string str)
   memcpy(value, str.c_str(), size);
 }
 
-std::string SOCKSDNSAddress::ToString()
-{
-  return std::string(value, size);
-}
-
-void SOCKSDNSAddress::PushBack(char c)
-{
-  value[size++] = c;
-}
-
 }  // namespace client
 }  // namespace kovri

src/client/proxy/socks.h

@@ -73,9 +73,15 @@ struct SOCKSDNSAddress {
 
   void FromString(std::string str);
 
-  std::string ToString();
-
-  void PushBack(char c);
+  std::string ToString()
+  {
+    return std::string(value, size);
+  }
+
+  void PushBack(char c)
+  {
+    value[size++] = c;
+  }
 };
 
 class SOCKSHandler