4506 GCC should be the primary compiler

*** 88,99 ****
  # The following version-specific options are operative regardless of which
  # compiler is primary, and control the versions of the given compilers to be
  # used.  They also allow compiler-version specific Makefile fragments.
  #
  
! __GNUC=                 $(POUND_SIGN)
! $(__GNUC)__SUNC=        $(POUND_SIGN)
  __GNUC64=               $(__GNUC)
  
  # CLOSED is the root of the tree that contains source which isn't released
  # as open source
  CLOSED=         $(SRC)/../closed
--- 88,99 ----
  # The following version-specific options are operative regardless of which
  # compiler is primary, and control the versions of the given compilers to be
  # used.  They also allow compiler-version specific Makefile fragments.
  #
  
! __SUNC=                 $(POUND_SIGN)
! $(__SUNC)__GNUC=        $(POUND_SIGN)
  __GNUC64=               $(__GNUC)
  
  # CLOSED is the root of the tree that contains source which isn't released
  # as open source
  CLOSED=         $(SRC)/../closed