util-lib: split xattr-related calls into xattr-util.[ch]

src/test/test-util.c

@@ -42,6 +42,7 @@
 #include "io-util.h"
 #include "mkdir.h"
 #include "parse-util.h"
+#include "path-util.h"
 #include "process-util.h"
 #include "rm-rf.h"
 #include "signal-util.h"
@@ -50,7 +51,7 @@
 #include "user-util.h"
 #include "util.h"
 #include "virt.h"
-#include "path-util.h"
+#include "xattr-util.h"
 
 static void test_streq_ptr(void) {
         assert_se(streq_ptr(NULL, NULL));