[BuildStream] Patch to fix spelling of its

[Richard Dale <richard dale codethink co uk>]

This is a bit of a boring patch, but I've been through the BuildStream 
sources and attempted to fix all instances of "its" wrongly spelled 
"it's", and "it's" wrongly spelled as "its".

--
Richard Dale
Software Developer - Codethink
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Attachment: 0001-Fix-spelling-of-it-s-and-its.patch
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