vfs: fail write_stat() on file descriptors opened read-only.

Change-Id: I20d586c606c47df6625cc9272f153250a5a621d6
Reviewed-on: https://review.haiku-os.org/706
Reviewed-by: waddlesplash <waddlesplash

vfs: fail write_stat() on file descriptors opened read-only.

Change-Id: I20d586c606c47df6625cc9272f153250a5a621d6
Reviewed-on: https://review.haiku-os.org/706
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

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* Added a small app that's able to truncate files - for testing purposes
only.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24570 a95241bf-73f2-0310-859d-f6bbb57e9c96