[Picolibc] Version 1.7

[Keith Packard]

Because of the (backward compatible) API/ABI change caused by merging
libm into libc, I've bumped from 1.6 to 1.7.

### Picolibc version 1.7

 1. Merge libc and libm into a single library. Having them split
    doesn't offer any advantages while requiring that applications add
    '-lm' to link successfully. Having them merged allows use of libm
    calls from libc code.

 2. Add hex float format to *printf, *scanf and strto{d,f,ld}. This is
    required for C99 support.

 3. Unify strto{d,f,ld} and *scanf floating point parsing code. This
    ensures that the library is consistent in how floats are parsed.

 4. Make strto{d,f,ld} set errno to ERANGE on overflow/underflow,
    including when the result is a subnormal number.

-- 
-keith
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