Copied gcc 2.7.2 style make-exe rule to gcc 2.8 conditional. This

lets the makefile work in both cases.

make/custom/Linux-posix.cfg

@@ -89,8 +89,13 @@ define make-exe
 endef
 else
 #
-# gcc28 not yet supported
+# just use the same make-exe as gcc 272
 #
+define make-exe
+	$(CC) -o $@ $(LINK_FILES) $(LD_LIBS) $(LIBC_LIBM) $(LIBC_LIBC)
+	$(NM) -ng $@ > $(basename $@).num
+	$(SIZE) $@
+endef
 endif