A few format fixes for targets with non-longlong CONSZ.
Make Nova compile again.
Re-teach configure about Nova.
new date 20140310
Fix bug when more reg classes than 4.
new date 20140312
WEAKREF is understood by modern assemblers.
Add __SIZEOF_LONG__ and __SIZEOF_POINTER__ to predefines.
Change __ashldi3, __ashrdi3 and __lshldi3 to LONGLONG.
new date 20140321
First cut of m68k support.  Compiles "Hello World".
Add m68k definitions.
new date 20140324
be consistent with AC_DEFINE, always provide a value.

(this fixes a problem with a script of mine, which does not handle
the /**/ that autoconf-2.69 uses when no value is provided)
new date 20140329
Bugfix a bunch of rules for the register allocator.
long -> int (we are not 64 bit).
Fixes for float printouts, still not correct but better.
Teach offstar to undertsand the basic OREGs.
Fix branches, add float regs, help register allocator a little,
and make prolog save the floating regs if necessary.
Add lots of instructions.
Must be really careful with register classes since we have separate
address registers.
Giving sysroot arg needs to modigy linker default libs also.