Make cflags and cxxflags work for intel linux.

This was originally in [50708] but appears to have been accidentally undone in
[51570].


[SVN r57140]

tools/build

@@ -1 +1 @@
-Subproject commit 40b04382bef443f6b1dfc7b7dbe2b68c2815d9d1
+Subproject commit 0206ac15a359a854d803d0a0c2e6f712daeec693