Fixing warning detected by additional compiler flags

Extractor/ExtractorCallbacks.cpp

@@ -78,7 +78,7 @@ bool ExtractorCallbacks::wayFunction(_Way &w) {
             w.nameID = strit->second;
         }
 
-        if(-1 == w.speed){
+        if(fabs(-1. - w.speed) < FLT_EPSILON){
             WARN("found way with bogus speed, id: " << w.id);
             return true;
         }

Extractor/ExtractorCallbacks.h

@@ -24,6 +24,8 @@ or see http://www.gnu.org/licenses/agpl.txt.
 #include <string>
 #include <vector>
 
+#include <cfloat>
+
 #include <boost/algorithm/string.hpp>
 #include <boost/algorithm/string/regex.hpp>
 #include <boost/regex.hpp>