Need reviewer: Exceptions to mapfile rule on shared libraries

[Kumar Srinivasan]

Looks ok to me.
> Some shared libraries do not have and will not have mapfiles, at least for now, we
> give these an exception to the mapfile check (which just issues a warning).
>
> 7033957: Library built without a mapfile: libxinerama.so
> http://cr.openjdk.java.net/~ohair/openjdk7/jdk7-build-mapfile-warning-sparc/webrev/
>
> -kto
>