gcc-toolfile: add missing '-Werror=return-local-addr' from GCC 4.8.X branch

Add missing piece (-Werror=return-local-addr) from GCC 4.8.X branch.

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
Merge pull request #1207 from davidlt/gcc-toolfile-gcc49

gcc-toolfile: add missing '-Werror=return-local-addr' from GCC 4.8.X branch