test: use local style includes where possible

This removes some assumptions that break building the library in
isolation.

test/algo/search.cpp

@@ -7,9 +7,9 @@
  *      2018, Danny Robson <danny@nerdcruft.net>
  */
 
-#include <cruft/util/algo/search.hpp>
-#include <cruft/util/tap.hpp>
-#include <cruft/util/point.hpp>
+#include "algo/search.hpp"
+#include "tap.hpp"
+#include "point.hpp"
 
 
 int

test/array/darray.cpp

@@ -1,5 +1,6 @@
-#include <cruft/util/tap.hpp>
-#include <cruft/util/array/darray.hpp>
+#include "tap.hpp"
+
+#include "array/darray.hpp"
 
 int
 main (int, char**)