cw: give cw(1onbld) a new interface allowing for multiple arbitrary shadows

*** 37,48 ****
  # # Override Makefile.master's settings of CC, CCC, AS and LINT # CC=
            $($(MACH64)_CC) CCC=          $($(MACH64)_CCC) CPP=
            $($(MACH64)_CPP) AS=          $($(MACH64)_AS) LD=
            $($(MACH64)_LD) LINT=         $($(MACH64)_LINT)
  
- REAL_CC=  $(CW_CC_CMD:sh) REAL_CCC=     $(CW_CCC_CMD:sh)
- 
  BUILD.SO= $(CC) $(CFLAGS) -o $@ $(GSHARED) $(DYNFLAGS)           $(PICS)
  $(EXTPICS) -L $(ROOTLIBDIR64) $(LDLIBS)
  
  # # ld(1) requires the -64 option to create a 64-bit filter solely from a
  mapfile # MAPFILECLASS=  -64
--- 37,46 ----