nuke GHC_DEBUG_HILEV_ASM and GHC_GCC_IS_AVAILABLE - never used.

don't set $(WAYS) in ghc/mk/paths.mk, set it explicitly in the
Makefiles where it is required (compiler/Makefile, lib/Makefile and
runtime/Makefile).

Remove the overriding of $(WAYS) from utils/*/Makefile.

No need to eliminate warnings for overlapped patterns in
Happy-generated parsers any more.

Don't compile OccurAnal with -O if we're using a pre-version-2 GHC,
since it seems there's an optimiser bug.

Changed def. for PROJECTVERSION

PROJECT* vars defined + make reading opts.mk optional

More small changes towards 2.02

Major update to more-or-less 2.02