Minor corrections.

src/tools/vmap-extractor/vmapexport.cpp

@@ -26,9 +26,8 @@
 #include <iostream>
 #include <vector>
 #include <list>
+#include <algorithm>
 #include <errno.h>
-#include <sstream>
-#include <iomanip>
 
 #if defined WIN32
 #include <Windows.h>

src/tools/vmap-extractor/vmapexport.h

@@ -68,7 +68,7 @@ std::string GetUniformName(std::string& path);
  * @brief Get extension for a file
  *
  * @param file
- * @return extension, if found, or std::string::npos if not
+ * @return extension, if found, or empty string if not
  */
 std::string GetExtension(std::string& file);