Add option to compile NaCL with glibc or newlib toolchains
Add fix for libatomic_ops on Nacl x86_64
Update Boehm GC and libatomic_ops
Update mono libgc to 6461347a5a36b16f8ade87f8c5e15073eb9f0cdf
Re-implement EclTerminal for NaCL based on naclport's python app