16765 loader: remove unused bzipfs, splitfs, pkgfs, ext2fs
Reviewed by: Bill Sommerfeld <sommerfeld@hamachi.org>
Approved by: Robert Mustacchi <rm@fingolfin.org>

14518 loader: linker cleanup
Reviewed by: Michael van der Westhuizen <r1mikey@gmail.com>
Approved by: Robert Mustacchi <rm@fingolfin.org>

14480 loader: restructure loader source tree
Reviewed by: Andy Fiddaman <andy@omnios.org>
Reviewed by: Michael van der Westhuizen <r1mikey@gmail.com>
Approved by: Robert Mustacchi <rm@fingolfin.org>