libcamera: Adapt Vector class to new location

Change the namespace of the Vector class from libipa to libcamera and
add it to the build.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

test/vector.cpp

@@ -5,14 +5,14 @@
  * Vector tests
  */
 
-#include "../src/ipa/libipa/vector.h"
+#include "libcamera/internal/vector.h"
 
 #include <cmath>
 #include <iostream>
 
 #include "test.h"
 
-using namespace libcamera::ipa;
+using namespace libcamera;
 
 #define ASSERT_EQ(a, b)							\
 if ((a) != (b)) {							\