[Picolibc] Version 1.8.2

[Keith Packard]

### Picolibc version 1.8.2

 * Support _ZEPHYR_SOURCE macro which, like _POSIX_SOURCE et al,
   controls whether the library expresses the Zephyr C library API.
   This is also automatically selected when the __ZEPHYR__ macro is
   defined and no other _*_SOURCE macro is defined.

 * Add another cross compile property, 'libgcc', which specifies the
   library containing soft float and other compiler support routines.

 * Fix a couple of minor imprecisions in pow and 80-bit powl.

 * Merge newlib changes that included an update to the ARM assembly
   code.

 * Replace inexact float/string conversion code with smaller code that
   doesn't use floating point operations to save additional space on
   soft float targets.

 * More cmake fixes, including making the inexact printf and locale
   options work.

-- 
-keith
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