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

*** 61,73 ****
  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
--- 61,70 ----