populate_sdk: verify executable or dynamically linked library

populate_sdk: verify executable or dynamically linked library

When toolchain directory is changed to execute mode, some non-executable
files or empty files are sorted. This will result in some errors. Thus when
sorting executable files or dynamically linked library, additional conditions
are to exclude non-executable files or empty files.

(From OE-Core rev: c9d56308bfa9ee7f4a9b22eae86390626ddc1c35)

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>