Statically link libgcc and libstdc++ into gold

gold built with newer mingw requires libgcc_sjlj_1.dll and
libstdc++-6.dll on runtime. Adding flags to link them statically.

Change-Id: Ic0d8143434164c6519c9e4b185a54cec3b8e72d6
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>
1 file changed