Rebuild musl with unwind changes and debug info

[al13n321]

In musl, checked out ClickHouse/musl#1 and did:

./clickhouse-configure && make

In sysroot did:

cp -r ~/musl/include/* linux-x86_64-musl/include/
cp ~/musl/lib/* linux-x86_64-musl/lib/

# Omit files that didn't already exist. If any of them were needed for clickhouse, presumably we'd
# get a linking error.
rm linux-x86_64-musl/include/alltypes.h.in linux-x86_64-musl/lib/Scrt1.o linux-x86_64-musl/lib/libc.so linux-x86_64-musl/lib/libcrypt.a linux-x86_64-musl/lib/libdl.a linux-x86_64-musl/lib/libm.a linux-x86_64-musl/lib/libresolv.a linux-x86_64-musl/lib/libutil.a linux-x86_64-musl/lib/libxnet.a linux-x86_64-musl/lib/musl-gcc.specs linux-x86_64-musl/lib/rcrt1.o

[al13n321]

(I don't particularly know what I'm doing:

• Sysroot has more include and lib files than musl. I guess the rest come from the ubuntu image? E.g. libgcc.a, include/c++/. Are they required? Are they difficult to compile by ourselves? Do they have a lot of code?
• Would it be hard to integrate it into the cmake build, making musl just another directory in contrib/?)

[al13n321]

CI builds passed in ClickHouse/ClickHouse#68313