update for lib/utils split

Update sources with the new paths

mu/mu-cmd-cfind.c

@@ -24,12 +24,13 @@
 #include <ctype.h>
 
 #include "mu-cmd.h"
-#include "mu-util.h"
-#include "mu-str.h"
-#include "mu-date.h"
 #include "mu-contacts.hh"
 #include "mu-runtime.h"
 
+#include "utils/mu-util.h"
+#include "utils/mu-str.h"
+#include "utils/mu-date.h"
+
 /**
  * guess the last name for the given name; clearly,
  * this is just a rough guess for setting an initial value.