cache: remove unused #includes

Also fix bees-roots's missing headers.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

include/crucible/cache.h

@@ -3,13 +3,11 @@
 
 #include "crucible/lockset.h"
 
-#include <algorithm>
 #include <functional>
 #include <list>
 #include <map>
 #include <mutex>
 #include <tuple>
-#include <vector>
 
 namespace crucible {
 	using namespace std;

src/bees-roots.cc

@@ -5,6 +5,7 @@
 #include "crucible/string.h"
 #include "crucible/task.h"
 
+#include <algorithm>
 #include <fstream>
 #include <tuple>