Added cmake common function to remove duplicated code in CMakefiles.txt files    set_common_build_variables() Tested: Mac OS
Added cmake common function to remove duplicated code in CMakefiles.txt files
   set_common_build_variables()
Tested: Mac OS

Change-Id: Id0ef3d32d1d17f56e3b19a20be79fd3c1b164061

google/breadboard,google/breadboard