Conditional builds fail for deeply nested source files.

[sam]

ie: ext/java/org/sam/cotton/Dispatcher.java fails to build since we don't detect any changes. Which would imply our glob isn't matching source files properly when packages are used in the directory tree.

[sam]

This actually appears to be an issue using Eclipse since it was generating builds in the background, which would throw off our max Pathname#mtime routine.

On a related note, we should attempt to match package-directory-structured Java sources to the root of tests though.