4506 GCC should be the primary compiler

@@ -88,12 +88,12 @@
 # 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)
+__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