[FS#194] lantiq: iproute2 fails to build on undefined constant PATH_MAX

[LEDE Bugs]

The following task is now closed:

FS#194 - lantiq: iproute2 fails to build on undefined constant PATH_MAX
User who did this - john (john)

Reason for closing: Fixed
Additional comments about closing: c57ffbb264c792c130b674d8dc51a4334ab63d7a

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=194