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Test errno constant macros, make ENOTSUP available in Rust

Peter Limkilde Svendsen requested to merge plimkilde/relibc:errno-const-macros into master

Recent versions of POSIX require that the errno constant values (E2BIG, EACCESS etc.) are provided as macros. This MR adds (script-generated) #ifdef tests for each value; the constants are already defined as macros in the autogenerated headers.

The ENOTSUP constant, which is set to the same value as EOPNOTSUPP, has been moved into the Rust source.

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