sort the files before checking to make the results comparable

main.cpp

@@ -8,6 +8,7 @@
 #include "CheckHeaders.h"
 #include "CheckOther.h"
 
+#include <algorithm>
 #include <iostream>
 #include <sstream>
 
@@ -147,6 +148,8 @@ int main(int argc, char* argv[])
         return 0;
     }
 
+    std::sort( filenames.begin(), filenames.end() );
+
     for (unsigned int c = 0; c < filenames.size(); c++)
     {
         errout.str("");