Make reasoning about dependencies easier by not including unused dependencies

src/script/standard.cpp

@@ -8,8 +8,6 @@
 #include <crypto/sha256.h>
 #include <pubkey.h>
 #include <script/script.h>
-#include <util/system.h>
-#include <util/strencodings.h>
 
 
 typedef std::vector<unsigned char> valtype;