Added description of 4.1 features, eg, -Wf-wchar_t=, and made minor edits.
Added description of 4.1 features, eg, -Wf-wchar_t=, and made
minor edits.


kervinck/gigatron-rom,kervinck/gigatron-rom,kervinck/gigatron-rom,kervinck/gigatron-rom,kervinck/gigatron-rom,kervinck/gigatron-rom,kervinck/gigatron-rom