added namespace and include to previous commit

apps/esmtool/esmtool.cpp

@@ -5,6 +5,7 @@
 #include <map>
 #include <set>
 #include <fstream>
+#include <cmath>
 
 #include <boost/program_options.hpp>
 
@@ -443,7 +444,7 @@ int clone(Arguments& info)
 
     int digitCount = 1; // For a nicer output
     if (recordCount > 0)
-        digitCount = (int)log10(recordCount) + 1;
+        digitCount = (int)std::log10(recordCount) + 1;
 
     std::cout << "Loaded " << recordCount << " records:" << std::endl << std::endl;