Update to 0.9

Few weeks ago I tried to make singe big update but it was terrible, this time I decided to do it in smaller parts and works great but history is messy. There is only one downstream patch which I'll try to upstream: 6d1c1815

I don't know reason for 97ceb586 but I reverted it to fix mprotect declaration.

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I have checked multiple times to make sure everything is fine. I don't think I missed anything but you can verify my diffs (or sysroots attached in Orig -> 0.9.0):

Original -> 0.6.0 + revert

0.6.0 -> 0.6.8

0.6.8 -> 0.8.7

0.8.7 -> 0.9.0

Everything at once + sysroots attached inside:

Original -> 0.9.0

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Related relibc changes: https://gitlab.redox-os.org/mati865/relibc/commits/cbindgen-update

P.S. When there is no sysroot related to the commit it means there were no differences.