[PATCH] CMake NSIS enable solid lzma compression

[İsmail Dönmez]

With the attached patch, the full set a of llvm setup.exe size goes
from 104mb to 73mb and packaging time increases by < 1 minute (8.35 ->
9.26) on my non-scientific tests.

I hope the time increase is negligible because overall size reduction
is pretty nice.

Ok to commit?

ismail
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