build: switch submodule to upstream jemalloc and link atomic for musl #138
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Summary
Point the jemalloc submodule to the official jemalloc/jemalloc repo instead of the tikv/jemalloc fork.
Always link libatomic when building for *-unknown-linux-musl targets to prevent undefined-reference errors like __atomic_exchange_1.
Details
.gitmodules: updated URL to https://github.com/jemalloc/jemalloc.
jemalloc-sys/build.rs: extend the existing RISC-V check so that libatomic is also linked for musl targets.
No behavioural changes in the resulting allocator.