[Picolibc] Version 1.7.3

[Keith Packard]

### Picolibc version 1.7.3

 1. Add -Wall -Wextra to default builds. Fixed warnings this raised.

 2. Add htonl and friends (based on __htonl). Thanks to Johan de
    Claville Christiansen

 3. Set errno in scalbn and scalbnf (patch forwarded to newlib).

 4. Merge newlib recent changes which includes a couple of libm fixes.

https://keithp.com/picolibc/dist/picolibc-1.7.3.tar.xz

Sha256 checksum:

e9d4c803b09eec387a4379209bf7ee3aa0cec47272c0651d38c474f09959c227 picolibc-1.7.3.tar.xz


-- 
-keith
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