6648 illumos build should be explicit about C standards

*** 42,60 ****
  COMOBJS=
  
  NATOBJS=        piglatin.o
  
  OBJECTS=        $(COMOBJS)  $(NATOBJS)
- NATIVECC_CFLAGS = -O
  
  AVLOBJ=         avl.o
  TOOL_OBJS=      sgsmsg.o string_table.o findprime.o assfail.o
  SGSMSG_OBJS=    $(TOOL_OBJS) $(AVLOBJ)
  SGSMSG_SRCS=    $(TOOL_OBJS:%.o=../common/%.c) \
                  $(AVLOBJ:%.o=$(VAR_AVLDIR)/%.c)
  
! $(SGSMSG_OBJS) := NATIVECC_CFLAGS += -I../../include $(VAR_TOOLS_CPPFLAGS)
  
  PROGS=          $(COMOBJS:%.o=%)
  NATIVE=         $(NATOBJS:%.o=%) sgsmsg
  SRCS=           $(COMOBJS:%.o=../common/%.c)  $(NATOBJS:%.o=../common/%.c)
  
--- 42,59 ----
  COMOBJS=
  
  NATOBJS=        piglatin.o
  
  OBJECTS=        $(COMOBJS)  $(NATOBJS)
  
  AVLOBJ=         avl.o
  TOOL_OBJS=      sgsmsg.o string_table.o findprime.o assfail.o
  SGSMSG_OBJS=    $(TOOL_OBJS) $(AVLOBJ)
  SGSMSG_SRCS=    $(TOOL_OBJS:%.o=../common/%.c) \
                  $(AVLOBJ:%.o=$(VAR_AVLDIR)/%.c)
  
! $(SGSMSG_OBJS) := NATIVE_CFLAGS += -I../../include $(VAR_TOOLS_CPPFLAGS)
  
  PROGS=          $(COMOBJS:%.o=%)
  NATIVE=         $(NATOBJS:%.o=%) sgsmsg
  SRCS=           $(COMOBJS:%.o=../common/%.c)  $(NATOBJS:%.o=../common/%.c)