Ensure prebuilt executables are executable

Use 'chmod +x' to make sure that they're executable, even if the source
file is not.

Bug: 28097475
Change-Id: Id155f6b4ff188f5c909fd6237fd64183af264f79
(cherry picked from commit 08420cbc8ac7dabe1ceb6334ee83727e18a80d96)
2 files changed