Use std::remove instead of std::filesystem::remove which is only available in C++17

src/Ramhash/src/lxrhash.cpp

@@ -147,7 +147,7 @@ bool LXRHash::load()
     if (check() != checksum)            // Then check that the checksum is correct
     {                                   //
         printf("checksum mismatch l:%llx != cs:%llx\n", cs, checksum);
-        std::filesystem::remove("byteMap.dat"); // Remove the bad file
+        std::remove("byteMap.dat"); // Remove the bad file
         return (false);                         // Return fail
     }                                           //
     return true;                                // If so, all good, don't need to regenerate the byteMap