Added some missing includes that only triggered a compiler error in

clang and also fixed a function call ambiguity.

dlib/matrix/matrix_la.h

@@ -5,6 +5,7 @@
 
 #include "matrix_la_abstract.h"
 #include "matrix_utilities.h"
+#include "../sparse_vector.h"
 
 // The 4 decomposition objects described in the matrix_la_abstract.h file are
 // actually implemented in the following 4 files.  

dlib/pixel.h

@@ -945,14 +945,14 @@ namespace dlib
         { 
             rgb_pixel temp;
             // convert target hsi pixel to rgb
-            assign(temp,dest);
+            assign_pixel_helpers::assign(temp,dest);
 
             // now assign the rgb_alpha value to our temp rgb pixel
-            assign(temp,src);
+            assign_pixel_helpers::assign(temp,src);
 
             // now we can just go assign the new rgb value to the
             // hsi pixel
-            assign(dest,temp);
+            assign_pixel_helpers::assign(dest,temp);
         }
 
     }

dlib/statistics/cca.h

@@ -6,6 +6,7 @@
 #include "cca_abstract.h"
 #include "../algs.h"
 #include "../matrix.h"
+#include "../sparse_vector.h"
 
 namespace dlib
 {