[Picolibc] Version 1.6.1

[Keith Packard]

As usual, doing a release (1.6) generates a bunch of minor bug
reports. 1.6.1 addresses those:

 1. Code cleanups for time conversion funcs (Thanks to R. Diez)

 2. Add '-fno-stack-protector' when supported by the C compiler
    to avoid trouble building with native Ubuntu GCC.

 3. Bug fix for converting denorms with sscanf and strto{d,f,ld}.

 4. Use __asm__ for inline asm code to allow building applications
    with --std=c18

 5. Fix exit code for semihosting 'abort' call to make it visible
    to the hosting system.

 6. Add strfromf and strfromd implementations. These are simple
    wrappers around sscanf, but strfromf handles float conversions
    without requiring a pass through 'double' or special linker hacks.

https://keithp.com/picolibc/dist/picolibc-1.6.1.tar.xz

eb112f5feb78a1ddf2e12cd16aaa66700e0d629ce15f53472651a572a49bbe9f picolibc-1.6.1.tar.xz

-- 
-keith
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