[Picolibc] Version 1.7.9

[Keith Packard]

Added a pile of new architecture targets so that picolibc now supports
everything that the Zephyr SDK does. And, finally eliminated 'struct
_reent' from the code entirely.

 * Support all Zephyr SDK targets

 * Support relocating the toolchain by using GCC_EXEC_PREFIX for
   sysroot-install when compiler doesn't use sysroot.

 * Add MIPS, SPARC and ARC support

 * Deal with RISC-V changes in gcc that don't reliably include zicsr

 * Support Picolibc as default C library with -Dsystem-libc option.
   With this, you can use picolibc without any extra compiler options.

 * Merge current newlib bits to get code that doesn't use struct _reent

 * Get rid of struct _reent in legacy stdio code

 * Support 16-bit int targets by fixing a few places assuming
   sizeof(int) == 4, object sizes not using size_t, wint_t for
   ucs-4 values

 * Add MSP430 support

 * Fix a couple of clang bugs (one on Cortex M0)

 * Support libc++ by adding non-standard mbstate_t.h

 * Merge i686 and x86_64 code to allow x86 multilib builds

 * Merge Xtensa newlib bits

 * Support Xtensa ESP32 targets

 * Add Nios II support

-- 
-keith
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