Update sysroots - #46
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linux-s390x: remove libcrypto/libssl/libcrypt (ClickHouse builds OpenSSL from sources), the duplicate s390x-linux-gnu/lib/gcc tree (clang only looks at lib/gcc/<triple>), and libgcc_eh.a / libgcc_s.so (never linked: ClickHouse uses -nodefaultlibs and its own compiler-rt). linux-aarch64: the shared objects are only opened by the linker for symbol resolution; their DWARF sections were ~20 MB of dead weight.
FreeBSD 13 is end-of-life and its releases are no longer on the main download mirror. All three sysroots are refreshed from https://download.freebsd.org/releases/{amd64,arm64/aarch64,powerpc/powerpc64le}/14.5-RELEASE/base.txz refresh-freebsd-sysroot.sh now also: - extracts only usr/include, usr/lib and lib from base.txz; - drops usr/include/c++ (ClickHouse builds its own libc++) and usr/include/private; - drops the static libc.a / libm.a / librt.a (FreeBSD binaries are linked dynamically); - copies Scrt1.o / crtbeginS.o / crtendS.o for PIE links; - finds librt.so in lib/ (moved there in FreeBSD 14); - handles the arm64/aarch64 and powerpc/powerpc64le mirror layout. The target triples in the main repository must be *-freebsd14 to match.
Add refresh-debian-sysroot.sh: fetches libc6, libc6-dev, linux-libc-dev and the default libgcc-<N>-dev for the target architecture in a throwaway Debian container, unpacks them and keeps only what the clang cross build needs (headers, startup objects, libgcc.a, the shared libc/libm and the libpthread/librt/libdl stubs). The result has Debian merged-/usr layout and a SOURCE.txt with the exact package versions. Two Debian 13 details are handled: linux-libc-dev is Architecture: all and ships usr/include/<triple>/asm as symlinks into usr/lib/linux/uapi, which are materialised as real files; and the libc.so linker script names ld.so by absolute path, so the lib -> usr/lib and lib64 -> usr/lib64 symlinks are created. linux-riscv64: Debian 13 (trixie), glibc 2.41-12+deb13u3, linux-libc-dev 6.12.94-1, gcc 14. Replaces a 2020 Debian sid snapshot (glibc 2.32, kernel 5.4). The gcc directory moved under usr/, so the toolchain file in the main repository passes --gcc-toolchain=<sysroot>/usr. linux-loongarch64: Debian sid, glibc 2.43-5, linux-libc-dev 7.1.13-1, gcc 16. Replaces glibc 2.36 / kernel 6.1. loong64 is not part of Debian 13.
Document which files every sysroot must contain and why, where each sysroot comes from (distribution, glibc, kernel headers, GCC version), which ones are frozen because they define the glibc floor of the release binaries, and the exact procedure to refresh each of them or add a new target.
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