rtapi/Submakefile:  rm THREADS_RTFLAGS frm universal source sim_rtapi_app.cc
kdetect universal binary doesn't need RT_LDFLAGS
rtapi_kdetect.c:  detect flavors from RH-style kernel release strings

RH kernel packages with 'variants' include the variant name separated
by a dot rather than a dash
configure.in:  RTAI 'fast-math' related CFLAGS should be set from rtai-config
Makefile:  clean up case when autogen needs running

- Neaten output
- Exit sooner (still not soon enough)
Get rid of RTSCC for once and for all
Plumb flavor RTS scripts for consistency