The all target in the makefile triggers "screen" and "remove" targets,
neither of which do anything useful/sane for our usecases. The simplest
way to get the makefile to behave is to only use the install target.
Clean up the recipe a bit whilst making these changes and simplify things.
[YOCTO #2194]
(From OE-Core rev: 06f6ca50c0cffdaf828688e01fcc70265eafa093)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>