Fix remote filesystem detection on FreeBSD

Need an extra include to get the definition of MNT_LOCAL

Fixes #11483

src/libc.c

@@ -4,6 +4,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/mount.h>
 #include <sys/resource.h>
 #include <unistd.h>