Fixed some build warnings; slightly improved python search

samples/cpp/brief_match_test.cpp

@@ -117,7 +117,7 @@ int main(int argc, const char ** argv)
 
   Mat outimg;
   drawMatches(im2, kpts_2, im1, kpts_1, matches_popcount, outimg, Scalar::all(-1), Scalar::all(-1),
-              reinterpret_cast<const vector<char>&> (outlier_mask));
+              *(const vector<char>*)(void*)(&outlier_mask));
   imshow("matches - popcount - outliers removed", outimg);
 
   Mat warped;

samples/cpp/delaunay2.cpp

@@ -55,8 +55,6 @@ static void locate_point( Mat& img, Subdiv2D& subdiv, Point2f fp, Scalar active_
 {
     int e0=0, vertex=0;
     
-    CvSubdiv2DEdge e00;
-    
     subdiv.locate(fp, e0, vertex);
     
     if( e0 > 0 )

samples/cpp/hybridtrackingsample.cpp

@@ -73,10 +73,9 @@ int main(int argc, char** argv)
 		return 1;
 	}
 
-	FILE* f;
+	FILE* f = 0;
 	VideoCapture cap;
 	char test_file[20] = "";
-	char dir[20] = "";
 
 	if (strcmp(argv[1], "live") != 0)
 	{