Distinguish between system headers and project headers.

Distinguish between system headers and project headers.

[Issue#] During compilation system and project headers were included the same way.
[Bug] N/A
[Cause] N/A
[Solution] Use -isystem flag to include system headers. In CMake files it's done by INCLUDE_DIRECTORY( SYSTEM ... ).
[Verification] Build commons. No warnings from system headers.

Change-Id: Ic8e35696f21da6674abc449e3ed272d07d050019