Add some comments to the Configfile
Build libfesvr.{so,a} along with fesvr.pc

I compared the static library with the old static library and it seems
that the new one has a whole bunch of extra symbols related to the C++
standard library (hopefully harmless?) as well as a number of missing
symbols.  The missing symbols are only things like "htif_eth_t", which
I believe shouldn't be in the static library anyway...