6648 illumos build should be explicit about C standards

*** 40,50 ****
  OPTION_UTILS    = $(POUND_SIGN)
  OPTION_DOCS     = $(POUND_SIGN)
  OPTION_FS       = $(POUND_SIGN)
  
  
! BASE_CFLAGS     = -B$(GCC_ROOT)/bin/ -g $(CPPFLAGS) $(OPTFLAGS)
  BASE_CCASFLAGS  = -B$(GCC_ROOT)/bin/ -g $(CPPFLAGS) $(OPTFLAGS)
  BASE_LDFLAGS    =
  
  CC              = $(GCC_ROOT)/bin/gcc
  CFLAGS          = $(BASE_CFLAGS)
--- 40,50 ----
  OPTION_UTILS    = $(POUND_SIGN)
  OPTION_DOCS     = $(POUND_SIGN)
  OPTION_FS       = $(POUND_SIGN)
  
  
! BASE_CFLAGS     = -B$(GCC_ROOT)/bin/ -g $(CPPFLAGS) $(OPTFLAGS) -std=gnu89
  BASE_CCASFLAGS  = -B$(GCC_ROOT)/bin/ -g $(CPPFLAGS) $(OPTFLAGS)
  BASE_LDFLAGS    =
  
  CC              = $(GCC_ROOT)/bin/gcc
  CFLAGS          = $(BASE_CFLAGS)