use += on cflags

Submitted-by: Steve Price <sprice@hiwaay.net>

activate the programs that will be used to manipulate kld modules

fix a few problems with missing headers, warn called with an exit
value, and undeclared getopt vars

these programs now compile -Wal

activate the programs that will be used to manipulate kld modules

fix a few problems with missing headers, warn called with an exit
value, and undeclared getopt vars

these programs now compile -Wall clean (and yes, I know I should use
more than just -Wall) :)

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Add utilities for the kernel linker.