util: Remove zero-argument versions of LogPrint and error

Changes in tinyformat, recently imported from upstream have made the
zero-argument versions of formatting functions unnecessary. Remove them.

This is a slight semantic change: `%` characters in the zero-argument
call are now regarded and need to be escaped. As for as I know, the only
use of this is in `main.cpp`.

src/main.cpp

@@ -4159,7 +4159,7 @@ bool CVerifyDB::VerifyDB(const CChainParams& chainparams, CCoinsView *coinsview,
     int nGoodTransactions = 0;
     CValidationState state;
     int reportDone = 0;
-    LogPrintf("[0%]...");
+    LogPrintf("[0%%]...");
     for (CBlockIndex* pindex = chainActive.Tip(); pindex && pindex->pprev; pindex = pindex->pprev)
     {
         boost::this_thread::interruption_point();

src/util.h

@@ -77,33 +77,17 @@ int LogPrintStr(const std::string &str);
 
 #define LogPrintf(...) LogPrint(NULL, __VA_ARGS__)
 
-template<typename T1, typename... Args>
-static inline int LogPrint(const char* category, const char* fmt, const T1& v1, const Args&... args)
+template<typename... Args>
+static inline int LogPrint(const char* category, const char* fmt, const Args&... args)
 {
     if(!LogAcceptCategory(category)) return 0;                            \
-    return LogPrintStr(tfm::format(fmt, v1, args...));
+    return LogPrintStr(tfm::format(fmt, args...));
 }
 
-template<typename T1, typename... Args>
-bool error(const char* fmt, const T1& v1, const Args&... args)
+template<typename... Args>
+bool error(const char* fmt, const Args&... args)
 {
-    LogPrintStr("ERROR: " + tfm::format(fmt, v1, args...) + "\n");
-    return false;
-}
-
-/**
- * Zero-arg versions of logging and error, these are not covered by
- * the variadic templates above (and don't take format arguments but
- * bare strings).
- */
-static inline int LogPrint(const char* category, const char* s)
-{
-    if(!LogAcceptCategory(category)) return 0;
-    return LogPrintStr(s);
-}
-static inline bool error(const char* s)
-{
-    LogPrintStr(std::string("ERROR: ") + s + "\n");
+    LogPrintStr("ERROR: " + tfm::format(fmt, args...) + "\n");
     return false;
 }