Remove pthread_set_name_np from NuttX

[no1wudi]

Description

Removed pthread_set_name_np function from the NuttX bindings as it does not exist in the NuttX API, this change aligns the code with the actual NuttX implementation

Sources

https://github.com/apache/nuttx/blob/8f3a2a6f7645dd95b6a7608b9cde3cb693b118c2/include/pthread.h#L511-L514

Checklist

• Relevant tests in libc-test/semver have been updated
• No placeholder or unstable values like *LAST or *MAX are
  included (see #3131)
• Tested locally (cd libc-test && cargo test --target mytarget);
  especially relevant for platforms that may not be checked in CI

[rustbot]

r? @tgross35

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[tgross35]

LGTM, blocked on #4254 for CI fixes.