nsis: use /solid compression for smaller size
nsis: use /solid compression for smaller size

Use /solid compression for smaller size.  By default nsis compresses
one file at a time (like .zip default), as opposed to the whole data
block (.tar.gz).  The latter gives significantly better compression,
so use it.

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

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