buildtools: Handle generic environment setup injection
Currently buildtools has its own hacked environment setup. We added
capability for generic script fragements but this code was never updated
to use it even if several components it contains needs it.
Remove a hardcoded variable in favour of the generic scripts to
avoid bugs in this area in future. The others should probably be
migrated to environment files in future too but there isn't such
a file for those at present.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit
eb210cee4bd71614dd108027e6d5aa8f8d451b27)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
