[Picolibc] Version 1.4.5

[Keith Packard]

Here's picolibc version 1.4.5. The main reason for the release is to fix
a bug in picolibc.ld that didn't sort the .preserve sections right
leading to random ordering of stuff in memory which broken some AltOS
applications.

However, this release also includes startup and TLS support for non
64-bit and Cortex-M 32-bit ARM targets, which allows those to be tested
at last.

Here's the README.md section:

### Picolibc version 1.4.5

 1. Fix section order in picolibc.ld to give applications correct
    control over the layout of .preserve, .init and .fini regions.

 2. Add startup and TLS support for aarch64 and non Cortex-M 32-bit
    arm.

-- 
-keith
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