dtrace_sdt: Register sdt providers and probes in loaded modules too.

Per the wiki roadmap, rename the three dtrace modules to have
a "dtrace_" prefix.
amd64 build tested, other set list changes done the same way.

remove unneeded include dirs.

Disable errors reported by unknown pragmas in dtrace module.

Include ../../Makefile.inc now that it works.

DTrace: fix a build problem for the SDT provider.

DTrace: Add an SDT (Statically Defined Tracing) provider framework, and
implement most of the proc provider. Adds proc:::create, exec,
exec_success, exec_faillure, signal_send, signal_discard, signa

DTrace: Add an SDT (Statically Defined Tracing) provider framework, and
implement most of the proc provider. Adds proc:::create, exec,
exec_success, exec_faillure, signal_send, signal_discard, signal_handle,
lwp_create, lwp_start, lwp_exit.

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