Add the Globs implementation from OpenJDK 7

http://hg.openjdk.java.net/jdk7/jdk7-gate/jdk/file/9b8c96f96a0f/src/share/classes/sun/nio/fs/Globs.java

As it's an undocumented implementation detail of the JDK, can only
really use it if we have our own copy.

Intended for use in https://github.com/rtyley/bfg-repo-cleaner