Move strprintf define to tinyformat.h

This avoids a dependency on util.h if just tinyformat is needed.

src/core.cpp

@@ -5,7 +5,7 @@
 
 #include "core.h"
 
-#include "util.h"
+#include "tinyformat.h"
 
 std::string COutPoint::ToString() const
 {

src/tinyformat.h

@@ -1007,4 +1007,6 @@ TINYFORMAT_WRAP_FORMAT_N(16, returnType, funcName, funcDeclSuffix, bodyPrefix, s
 
 } // namespace tinyformat
 
+#define strprintf tfm::format
+
 #endif // TINYFORMAT_H_INCLUDED

src/util.h

@@ -108,7 +108,6 @@ bool LogAcceptCategory(const char* category);
 /* Send a string to the log output */
 int LogPrintStr(const std::string &str);
 
-#define strprintf tfm::format
 #define LogPrintf(...) LogPrint(NULL, __VA_ARGS__)
 
 /* When we switch to C++11, this can be switched to variadic templates instead