Pass variables prefixed with both LD_ and LD_32_ to the run-time linker.
This prevents unintentional execution of programs when running ldd(1) on
32-bit Linux binaries.

PR:		175339, 127276
Suggested by:	kib, rstone
Reviewed by:	kib
MFC after:	2 weeks
Fix a timing issue with the wired driver.

After configuring the interface, wait for the link to become active.
Many ethernet drivers reset the chip when we set multicast filters
(causing significant delays due to link re-negotiation) and, by the time
we start sending packets, they are discared instead of going to the ether.

Tested by:	dumbbell