Fresh Git version - undefined reference to `vlan_find'

[cpservicespb]

There are links where attempting to do "Strip 802.1Q VLAN 0 priority tags" so is represented.
Moreover there is the patch in Debian rules for building iPXE deb package for Ubuntu.

Both links I think almost the same.
Link1: https://lists.ipxe.org/pipermail/ipxe-de...05099.html
Link2: https://code.launchpad.net/~paelzer/ubun...rge/360679

I made additionally investigation and for freshest git version there are 2 changes are required more:
vlan.c = remove static for <vlan_find> function;

was

Code:

static struct net_device * vlan_find ( struct net_device *trunk,
                                            unsigned int tag ) {

became:

Code:

struct net_device * vlan_find ( struct net_device *trunk,
                                            unsigned int tag ) {

vlan.h = define as extern <vlan_find> function;
add

Code:

extern struct net_device * vlan_find ( struct net_device *trunk,
                                            unsigned int tag ) ;

Otherwise error for vlan_find unrecognized symbol will be got during ld stage.