util: move logind_running() to login-util.[ch]

src/basic/login-util.h

@@ -22,5 +22,10 @@
 #pragma once
 
 #include <stdbool.h>
+#include <unistd.h>
 
 bool session_id_valid(const char *id);
+
+static inline bool logind_running(void) {
+        return access("/run/systemd/seats/", F_OK) >= 0;
+}

src/basic/util.h

@@ -617,10 +617,6 @@ static inline unsigned log2u_round_up(unsigned x) {
         return log2u(x - 1) + 1;
 }
 
-static inline bool logind_running(void) {
-        return access("/run/systemd/seats/", F_OK) >= 0;
-}
-
 #define DECIMAL_STR_WIDTH(x)                            \
         ({                                              \
                 typeof(x) _x_ = (x);                    \