Make reasoning about dependencies easier by not including unused dependencies

src/script/script.cpp

@@ -5,7 +5,6 @@
 
 #include <script/script.h>
 
-#include <tinyformat.h>
 #include <util/strencodings.h>
 
 const char* GetOpName(opcodetype opcode)

src/script/sigcache.cpp

@@ -5,7 +5,6 @@
 
 #include <script/sigcache.h>
 
-#include <memusage.h>
 #include <pubkey.h>
 #include <random.h>
 #include <uint256.h>

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;