Put the NOAOUT in one place

Remove many HAVE_GCC || HAVE_PCC conditionals as the options also apply
to Clang. Add a few cases of HAVE_LLVM for -fno-strict-aliasing.

remove most of the remaining HAVE_GCC tests that are always true in
the modern world.

Wrap compiler-specific flags with HAVE_GCC and HAVE_PCC as necessary. Add a few flags for PCC.

use -Wno-pointer-sign with GCC4.

- compile common code once (into libcommon.a), and link that in.
cut's compilation time by half!
- build a common version.c in libcommon.a
- don't build version.h - nothing uses it
- comment out th

- compile common code once (into libcommon.a), and link that in.
cut's compilation time by half!
- build a common version.c in libcommon.a
- don't build version.h - nothing uses it
- comment out the ifdef INFO and -DINFO stuff - it's always compiled in
- XXX: don't compile mopprobe with -DNODL (which actually changes the
compilation of stuff in common/*). nothing else does this, and it
meant that mopprobe would have had different behaviour. if this behaviour
is desired, a workaround can be put in place

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- Move common definitions to Makefile.inc
- Revert change common/os.h -> os.h. From Mats O Jansson.

Don't need to .PATH: .. or -I${.CURDIR}/common and -I${.CURDIR}; it will
actually break things in the future.

RCS id police.

Makefile cleanups

Import of Mats O Jansson's MOP boot program for DEC machines.