Change-Id: I1728e08622dbdec9bd1e37a9ba6afff80e8fb847
. only good for obsolete K&R support . also remove a stray ansi.h and the proto cmd
The implementation is in libblockdriver, and works transparently for all block drivers. The new btrace(8) tool can be used to control block tracing; see ``man btrace'' for details.