boost: properly fix do_boostconfig re-execution
* it was partially fixed in:
commit
291e20a51544c640d07767d1dc32d762f4370f41
Author: Venkata ramana gollamudi <ramana.gollamudi@huawei.com>
Date: Fri Apr 13 11:42:46 2012 +0000
Subject: boost: fix re-execution of task
but with disadvantage that when CXX or *FLAGS variables were changed
it was continuing to use old values
* just remove the line before appending it with current values to fix
that
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
