redox: Export UDS, resource, syslog, and others #2667
                
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What does this PR do
I exported a few supported Redox features:
resource.h, syslog, and somefcntl.hconstants. Some of these changes only work onlibc's main branch as I only recently enabled them there too which is why I'm keeping this as a draft.Checklist:
CONTRIBUTING.md