toolchain-shar-extract.sh: ensure cleaned environment will work for ext SDK
In OE-Core revision
6d2074d477596971dc52027dd87b02af7f39138d we added a
line which re-executes the script with a cleaned environment using
env -i; unfortunately that caused a regression in the extensible SDK on
Ubuntu 14.04 - strangely, there it seems that the value you get for PATH
under env -i contains '.' which triggers a sanity check failure when
preparing the build system. Do a belt-and-braces fix - source
/etc/environment if it exists (so you get a more complete PATH value)
and then filter any nastiness out of PATH for good measure. (Ubuntu
15.04 doesn't seem to suffer from the same problem.)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
