Auto-sync with upstream release/2.26/master
    
    Upstream commit: fdf58ebc60ce0eb459fd616241b52872b3571ac1
    
    - Drop glibc-gcc-strict-overflow.patch, different workaround applied upstream.
    - Fix nearbyint arithmetic moved before feholdexcept (swbz#22225)
    - Avoid __MATH_TG in C++ mode with -Os for fpclassify (swbz#22146)
    - Place $(elf-objpfx)sofini.os last (swbz#22051)
    - __libc_dynarray_emplace_enlarge: Add missing else
    - dynarray: Set errno on overflow-induced allocation failure
    - resolv: __resolv_conf_attach must not free passed conf object (swbz#22096)
    - resolv: Fix memory leak with OOM during resolv.conf parsing (swbz#22095)
    - nss_dns: Remove dead PTR IPv4-to-IPv6 mapping code