Added setegid function
Adding the `setegid` function to libc. I had a look and this is in Apple, Linux and Fuchsia so I'm hoping it works for all the BSDs etc. But if anything fails in CI I'll change it accordingly.
Bump ctest from 0.2.7 to 0.2.8
Bumps [ctest](https://github.com/alexcrichton/ctest) from 0.2.7 to 0.2.8.
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Remove unreachable fuchsia branches
cc @cramertj
So this should be a non-functional change because these branches are unreachable, but please try to build fuchsia with this change to make sure this doesn't break anything.
Bump ctest from 0.2.6 to 0.2.7
Bumps [ctest](https://github.com/alexcrichton/ctest) from 0.2.6 to 0.2.7.
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Add a couple pthread function definitions and get_sched for musl.
I missed `pthread_setaffinity_np` for the musl variant, so I added a few missing function declarations for musl.
Add various strcase* functions and getline
Adds
* `strcasestr`
* `strcasecmp`
* `strncasecmp`
* `getline`
I *think* they're semi-universal, but shall see what CI pops up...
