Replace C++ (//) comments with C block comments (/* ... */).

This is one problem killing Itanium builds. One more to go.



[SVN r64204]

tools/build

@@ -1 +1 @@
-Subproject commit 62e4971d9aba9978c6996dce91823ca8c6f03bcb
+Subproject commit a24d91c8d5333d1843168993e1462498c4b3c326