Merge bitcoin/bitcoin#36706: policy: remove unused GetVirtualTransactionInputSize

### src/policy/policy.cpp
@@ -401,8 +401,3 @@ int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t nSigOpCost, un
 {
     return GetVirtualTransactionSize(GetTransactionWeight(tx), nSigOpCost, bytes_per_sigop);
 }
-
-int64_t GetVirtualTransactionInputSize(const CTxIn& txin, int64_t nSigOpCost, unsigned int bytes_per_sigop)
-{
-    return GetVirtualTransactionSize(GetTransactionInputWeight(txin), nSigOpCost, bytes_per_sigop);
-}

### src/policy/policy.h
@@ -174,18 +174,12 @@ bool SpendsNonAnchorWitnessProg(const CTransaction& tx, const CCoinsViewCache& p
 /** Compute the virtual transaction size (weight reinterpreted as bytes). */
 int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost, unsigned int bytes_per_sigop);
 int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop);
-int64_t GetVirtualTransactionInputSize(const CTxIn& tx, int64_t nSigOpCost, unsigned int bytes_per_sigop);
 
 static inline int64_t GetVirtualTransactionSize(const CTransaction& tx)
 {
     return GetVirtualTransactionSize(tx, 0, 0);
 }
 
-static inline int64_t GetVirtualTransactionInputSize(const CTxIn& tx)
-{
-    return GetVirtualTransactionInputSize(tx, 0, 0);
-}
-
 int64_t GetSigOpsAdjustedWeight(int64_t weight, int64_t sigop_cost, unsigned int bytes_per_sigop);
 
 static inline FeePerVSize ToFeePerVSize(FeePerWeight feerate) { return {feerate.fee, (feerate.size + WITNESS_SCALE_FACTOR - 1) / WITNESS_SCALE_FACTOR}; }

### src/test/fuzz/tx_in.cpp
@@ -4,7 +4,6 @@
 
 #include <consensus/validation.h>
 #include <core_memusage.h>
-#include <policy/policy.h>
 #include <primitives/transaction.h>
 #include <streams.h>
 #include <test/fuzz/fuzz.h>
@@ -21,7 +20,6 @@ FUZZ_TARGET(tx_in)
     }
 
     (void)GetTransactionInputWeight(tx_in);
-    (void)GetVirtualTransactionInputSize(tx_in);
     (void)RecursiveDynamicUsage(tx_in);
 
     (void)tx_in.ToString();

### src/wallet/test/wallet_tests.cpp
@@ -639,7 +639,7 @@ static size_t CalculateNestedKeyhashInputSize(bool use_max_sig)
 
     CTxIn tx_in;
     UpdateInput(tx_in, sig_data);
-    return (size_t)GetVirtualTransactionInputSize(tx_in);
+    return (size_t)GetVirtualTransactionSize(GetTransactionInputWeight(tx_in), 0, 0);
 }
 
 BOOST_FIXTURE_TEST_CASE(dummy_input_size_test, BasicTestingSetup)