util: remove missed declarations

Author: div72

src/util.h

@@ -118,8 +118,6 @@ std::string GetFileContents(const fs::path filepath);
 
 int64_t GetTimeOffset();
 int64_t GetAdjustedTime();
-std::string FormatFullVersion();
-std::string FormatSubVersion(const std::string& name, int nClientVersion, const std::vector<std::string>& comments);
 void AddTimeData(const CNetAddr& ip, int64_t nOffsetSample);
 void runCommand(std::string strCommand);