posix: fcntl: declare fcntl(2) in fcntl.h
The `fcntl.h` header should declare the `fcntl()` function,
according to the spec.
Signed-off-by: 
Chris Friedt <cfriedt@meta.com>
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The `fcntl.h` header should declare the `fcntl()` function,
according to the spec.
Signed-off-by: Chris Friedt <cfriedt@meta.com>