remove update_dyld_shared_cache check

src/help.c

@@ -121,13 +121,7 @@ void checkpath(void) {
     TAR,
     DIFF,
     BACKEND,
-    /* Mac OS X uses dyld (Mach-O) instead of ld.so (ELF), and does not have
-     * an ldconfig. */
-#if defined(__APPLE__) && defined(__MACH__)
-    "update_dyld_shared_cache",
-#else
-    "ldconfig",
-#endif
+    "launchctl",
 #if BUILD_START_STOP_DAEMON
     "start-stop-daemon",
 #endif