Merge bitcoin#9282: CMutableTransaction is defined as struct

c4b6fa8 CMutableTransaction is defined as struct. (Pavel Janík)

Author: laanwj

src/core_io.h

@@ -11,7 +11,7 @@
 class CBlock;
 class CScript;
 class CTransaction;
-class CMutableTransaction;
+struct CMutableTransaction;
 class uint256;
 class UniValue;