scripted-diff: Avoid interface keyword to fix windows gitian build

Rename `interface` to `interfaces`

Build failure reported by Chun Kuan Lee <ken2812221@gmail.com>
https://github.com/bitcoin/bitcoin/pull/10244#issuecomment-379434756

-BEGIN VERIFY SCRIPT-

git mv src/interface src/interfaces
ren() { git grep -l "$1" | xargs sed -i "s,$1,$2,g"; }
ren interface/            interfaces/
ren interface::           interfaces::
ren BITCOIN_INTERFACE_    BITCOIN_INTERFACES_
ren "namespace interface" "namespace interfaces"

-END VERIFY SCRIPT-

src/qt/coincontroldialog.cpp

@@ -14,7 +14,7 @@
 #include <qt/walletmodel.h>
 
 #include <wallet/coincontrol.h>
-#include <interface/node.h>
+#include <interfaces/node.h>
 #include <key_io.h>
 #include <policy/fees.h>
 #include <policy/policy.h>
@@ -648,7 +648,7 @@ void CoinControlDialog::updateView()
         int nChildren = 0;
         for (const auto& outpair : coins.second) {
             const COutPoint& output = std::get<0>(outpair);
-            const interface::WalletTxOut& out = std::get<1>(outpair);
+            const interfaces::WalletTxOut& out = std::get<1>(outpair);
             nSum += out.txout.nValue;
             nChildren++;