Remove "-ccopt -g" options: not really useful and causing problems with...

Remove "-ccopt -g" options: not really useful and causing problems with flexdll in the Win32/mingw port of Caml.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1140 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e