update_prebuilts.py: make contents of lld-bin executable

Python's ZipFile.extractall strips the executable bits from the
permissions.  update_prebuilts.py restores the executable bits for
the files it moves into the bin directory, but that doesn't cover the
lld-bin directory.  Manually mark any files in the lld-bin directory
executable.

Bug: 180055535
Test: ./update_prebuilts.py -b 6752562
Change-Id: I40a2a1c479ada224dbbe0b662779594f6094839c
1 file changed