treewide: remove cache.h inclusion due to setup.h changes

By moving several declarations to setup.h, the previous patch made it
possible to remove the include of cache.h in several source files.  Do
so.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

path.c

@@ -1,7 +1,7 @@
 /*
  * Utilities for paths and pathnames
  */
-#include "cache.h"
+#include "git-compat-util.h"
 #include "abspath.h"
 #include "environment.h"
 #include "gettext.h"