fix(jemalloc-sys): pin --libdir to avoid distro site-script lib64 redirect

[rtyler]

This was a 🦜 generated fix to a build error that has been buggin' the heck out of me in delta-io/delta-rs when using aarch64 machines.

Some Linux distributions ship an autoconf site-script (/usr/share/site/) that silently rewrites the configured libdir from ${prefix}/lib to ${prefix}/lib64 for 64-bit hosts (e.g. the OpenSUSE aarch64 site script). jemalloc is compiled via ./configure inside the build script, so its static libraries end up in $OUT_DIR/lib64. However, build.rs hard-codes the link-search path as $OUT_DIR/lib, so cargo can't find libjemalloc_pic.a and the build fails with:

error: could not find native static library jemalloc_pic,
perhaps an -L flag is missing?

Fix: pass --libdir=${out_dir}/lib explicitly to configure. This overrides any site-script redirect and keeps the installed path consistent with the search path already emitted by build.rs.

Reproduces on: OpenSUSE Leap 16 aarch64 (site script at /usr/share/site/aarch64-unknown-linux-gnu).

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[ti-chi-bot]

Welcome @rtyler! It looks like this is your first PR to tikv/jemallocator 🎉