image-mklibs: Fix grep pattern when mklibs collects executables in rootfs
File command in some version could print extra space between
"LSB" and "executable" - it causes mklibs can't find any executables
using grep "LSB executable". Fix the grep pattern to catch
multiple spaces.
(From OE-Core master rev:
a52ef8c5dcd71f39bb48c71fb868cc0db662560e)
Signed-off-by: Lei Liu <lei.liu2@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
