FIX Issue#548 Update Loader: INCLUDED? doesn't work properly with encapped Re

Removing `join encap-fs/base file` seems to attach 'none value to the beginning of the file name, so the file does not match properly with previously included files.

I tested this by encapping red and testing with Kaj's SDL examples that were double including common.reds and failing to compile.  With this change, those files compiled without trouble.
Revert "FIX Issue#548 Update Loader: INCLUDED? doesn't work properly with encapped Re"

This reverts commit 3187001b90904a72a332464a72185f504e8e3853.
Update Red/System loader.r to exclude encap-fs/base if 'none
Merge pull request #550 from kealist/master

FIX Issue#548 Update Loader: INCLUDED? doesn't work properly with encapp...