Bump musl from v1.2.2 to v1.2.5

[TommyMurphyTM1234]

As with Linux/uClibc:

• Bump uClibc from v1.0.48-7-gad21b95c9 to v1.0.50 #1564 (comment)

the riscv-gnu-toolchain Makefile[.in] is not set up to facilitate the running of the test suite for the Linux/musl toolchain so this bumping of the submodule version can only be done "blindly" right now.

[cmuellner]

LGTM

[cmuellner]

Thanks for the PR!

I've double-checked the commit/tag and the CI is happy.

[TommyMurphyTM1234]

Thanks @cmuellner. 👍

musl v1.2.5 also now supports RV32:

• https://musl.libc.org/releases.html

musl-1.2.5.tar.gz (sig) - February 29, 2024
This release adds extension functions statx and preadv2/pwritev2, with fallback implementations for older kernels, and adds two new ports: loongarch64 and riscv32. Minor changes to the printf family of functions have been made for conformance to new standards interpretations/requirements. TLSDESC support for riscv64 has also been added.

so the limitation imposed by this commit is no longer required:

• 629c67e

I may prepare a PR to remove this limitation if that's OK?

Curiously, some work to allow an RV32 build of the Linux/musl toolchain was done a long time ago even though musl presumably didn't support RV32 at the time which is odd...

• Allow building a 32bit musl toolchain #392