[Coco] toolshed under Linux

[Alex Evans]

The last couple updated to the mercurial repository are causing
compilation errors under Arch Linux x86_64 (gcc 9.3.0-1).

The first is there are a number of places where  character arrays are
detected as potentially not being long enough and as a result are
throwing warnings which combined with -Werror prevents compilation.

The second is that the order of the libraries linked for cecb is
wrong. -lnative needs to be after
-lcecb because libcecb.a contains dependencies on libnative.