[Picolibc] Version 1.4.3

[Keith Packard]

With an improved set of fixes for the newlib stdio CVEs and brand new
exact floating point code from tinystdio, plus a range of other fixes,
it seems like it's about time for version 1.4.3.

Here's the notes from README.md about this release:

### Picolibc version 1.4.3

 1. Make fix for CVE 2019-14871 - CVE 2019-14878 in original newlib
    stdio code not call 'abort'. Allocation failures are now reported
    back to the application.

 2. Add 'exact' floating point print/scan code to tinystdio. Thanks
    to Sreepathi Pai for pointing me at the Ryu code by Ulf
    Adams.

 3. Add regular expression functions from newlib. These were removed
    by accident while removing POSIX filesystem-specific code.

 4. Make tinystdio versions of [efg]cvt functions. This means that the
    default tinystdio version of picolibc no longer calls malloc from
    these functions.    

 5. More clang-compatibility fixes. (Thanks to Denis Feklushkin)

 6. Remove stdatomic.h and tgmath.h. (they should not be provide by picolibc)


-- 
-keith
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