[clang-tidy][Part1] Add a new module Android and three new checks.
A common source of security bugs is code that opens a file descriptors without using the O_CLOEXEC flag. (Without that flag, an opened sensitive file would remain open across a fork+exec to a lower-privileged SELinux domain, leaking that sensitive data.).
Add a new Android module and one checks in clang-tidy.
- open(), openat(), and open64() should include O_CLOEXEC in their flags argument. [android-file-open-flag]
Reviewers: chh, alexfh, aaron.ballman, hokein
Reviewed By: alexfh, hokein
Subscribers: jbcoe, joerg, malcolm.parsons, Eugene.Zelenko, srhines, mgorny, xazax.hun, cfe-commits, krytarowski
Differential Revision: https://reviews.llvm.org/D33304