[Picolibc] Version 1.4.6

[Keith Packard]

Lots of work last month on various cleanups. Here's what's in the README:

 1. Install 'ssp' (stack smashing protection) header files. This fixes
    compiling with -D_FORTIFY_SOURCE.

 2. Make getc/ungetc re-entrant. This feature, which is enabled by
    default, uses atomic instruction sequences that do not require
    OS support.

 3. Numerous iconv fixes, including enabling testing and switching
    external CCS file loading to use stdio. By default, iconv provides
    built-in CCS data for all of the supported encodings, which takes
    a fairly large amount of read-only memory. Iconv is now always
    included in picolibc as  it isn't included in applications unless
    explicitly referenced by them.

 4. Add __getauxval stub implementation to make picolibc work with
    GCC version 10 compiled for aarch64-linux-gnu.

 5. Change how integer- and float- only versions of printf and scanf
    are selected. Instead of re-defining the symbols using the C
    preprocessor, picolibc now re-defines the symbols at link
    time. This avoids having applications compiled with a mixture of
    modes link in multiple versions of the underlying functions, while
    still preserving the smallest possible integer-only
    implementation.

 6. Document how to use picolibc on a native POSIX system for
    testing. Check out the [os.md](doc/os.md) file for details.

 7. Merge current newlib bits in. This includes better fenv support,
    for which tests are now included in the picolibc test suite.

-- 
-keith
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