Refresh native part of org.simantics.fastlz compilation instructions.

Added Visual Studio 2012 solution/project for compiling with Microsoft
Platform SDK for Windows Server 2003 R2.

Renamed libfastlz-darwin-x86_64.jnilib to libfastlz-darwin-x86_64.dylib
since .dylib is what System.mapLibraryName adds to library names. Also
updated compile.sh to produce .dylib on Darwin.

Removed LZ4 codes from the native codebase, they are already elsewhere
and don't belong here anymore.

refs #6675

Change-Id: I8dc95c5f91bc906c627b47e32ee1b9d1b6a4cb6d
Signed-off-by: Tuukka Lehtonen <tuukka.lehtonen@semantum.fi>