Reduced modules dependencies:

- made some of dependencies explicit
- removed dependencies to highgui and some other modules where possible
- modified some samples to build without modules

modules/line_descriptor/samples/matching.cpp

@@ -39,15 +39,16 @@
  //
  //M*/
 
-#include <opencv2/line_descriptor.hpp>
+#include <iostream>
 
+#ifdef HAVE_OPENCV_FEATURES2D
+
+#include <opencv2/line_descriptor.hpp>
 #include "opencv2/core/utility.hpp"
 #include <opencv2/imgproc.hpp>
 #include <opencv2/features2d.hpp>
 #include <opencv2/highgui.hpp>
 
-#include <iostream>
-
 #define MATCHES_DIST_THRESHOLD 25
 
 using namespace cv;
@@ -207,3 +208,12 @@ int main( int argc, char** argv )
 
 }
 
+#else
+
+int main()
+{
+    std::cerr << "OpenCV was built without features2d module" << std::endl;
+    return 0;
+}
+
+#endif // HAVE_OPENCV_FEATURES2D