[Picolibc] Picolibc version 1.3 released

[Keith Packard]

This release now includes tests, and fixes bugs found by them.

 1. ESP8266 support added, thanks to Jonathan McDowell.

 2. Numerous test cases from newlib have been fixed, and
    precision requirements adjusted so that the library now
    passes its own test suite on x86, RISC-V and ARM.

 3. String/number conversion bug fixes. This includes fcvt/ecvt/gcvt
    shared with newlib and tinystdio printf/scanf

 4. A few RISC-V ABI fixes, including setting the TLS base correctly,
    compiling with -mcmodel=medany, and enabling the FPU for libraries
    built to use it.

 5. Semihosting updates, including adding unlink, kill and getpid
    (which are used by some tests).

Tests are run on ARM during Debian builds. I've run the tests locally on
RISC-V, but that requires updates to qemu which are not yet upstream.

-- 
-keith
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