modules/picolibc: Include clang+cmake and old GCC changes

This updates west.yml to pull the version of picolibc that includes both
the patches in #54391 as well as the fix providing compatibility for the
'deprecated' attribute when using GCC versions before 4.5, such as the GCC
based XCC compiler. Changes for 'weak' attributes were added to avoid using
inline asm statements for compilers that support the necessary attributes.

This commit is synchronized with Zephyr SDK:

https://github.com/zephyrproject-rtos/sdk-ng/pull/650



Signed-off-by: Keith Packard <keithp@keithp.com>