7191556: (fs) UnixNativeDispatcher.getextmntent should be moved into platform specific code

[Alan Bateman]

This one has been in my patch queue for a long time, I'd actually 
forgotten about it. It's also just a clean-up covering two issues:

1. UnixNativeDispatcher defines getextmntent to read an entry from the 
mount table but it's not very portable with lots of #ifdef for each 
platform. The change moves this method down to SolarisNativeDispatcher 
and adds a getmntent to LinuxNativeDispatcher so it's much cleaner.

2. When the Mac port was added then it included the GNOME 
FileTypeDetector which I don't think makes sense because it will never 
be used. The clean-up here is to not build this FileTypeDetector on Mac. 
The DefaultFileTypeDetector that is compiled when building on 
Solaris/Linux/Mac is changed so that it delegates to the 
FileSystemProvider to get the file type detector and this ensures that 
the proper implementation is included.

As I say, this is solely clean-up so there isn't a test. The webrev with 
the changes is here:

http://cr.openjdk.java.net/~alanb/7191556/webrev/

-Alan.
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