gcc: Add Fortran support for lsi-image-large

For lsi-image-large add by default Fortran support to gcc compiler.
Enable Fortran for axxiaarm and axxiapowerpc machine, add packages
for Fortran support and append gcc-runtime_4.8 receipe to add
Fortrun lib as RUNTIMETARGET.

Signed-off-by: Daniel Dragomir <daniel.dragomir@windriver.com>