Enable changes needed for ChromeOS build

[anikulk]

• Add TARGET_OS variable to build without lto optimizations.
• Add defaulted destructor and assignment operator when constructor is default.

Change-Id: I041f567b58f513916bcc132c6ff8d260574a9d4f Signed-off-by: Anisha Kulkarni anisha.dattatraya.kulkarni@intel.com

[anikulk]

Gentle ping on this PR

[krzysztofjozwiak]

Changes already integrated via other commit.