[ruby-core:116044] [Ruby master Misc#20156] C99 updates

Issue #20156 has been reported by kddnewton (Kevin Newton).

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Misc #20156: C99 updates
https://bugs.ruby-lang.org/issues/20156

* Author: kddnewton (Kevin Newton)
* Status: Open
* Priority: Normal
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Now that we require Visual Studio 2015 and Oracle Developer Studio 12.5, we can do a couple of things to clean up:

* We should be able to remove our custom `stdbool.h` (added in VS2015 and Oracle SS 12.3)
* Remove our usage of `__restrict` for Windows (added in VS2015)
* Remove our custom `va_copy` (added in VS2015)

Just notating, a couple of things that we _can_ use now:

* snprintf
* size_t printf format specifier (%z)

I'm happy to do this work, but I wanted to open this ticket in case there is something besides Visual Studio or Oracle Solaris Studio that I would have missed for one of our compilation targets. Are there any other targets that do not fully implement C99?



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