www/seamonkey 2.53.24p1 OpenBSD

from a larger diff by Leah Rowe, thanks ! this option has been turned on in upstream CI since #1261841 (but only on x86/arm64), and allows to use simd acceleration in encoding functions (and probably other features in rust crates..) runtime-tested with seamonkey, firefox, firefox-esr & thunderbird on amd64, and firefox on arm64. jca@ made sure MOZ_RUST_SIMD wasnt enabled on riscv64. since i'm bumping REVISION on all consumers, might aswell bump nss dependency to 3.128.

hunspell_fopen_hooks.h contains a preprocessor hack to replace the standard fopen() with one supporting readahead. This used to work because libcxx's fstream header used a naked fopen() call. libcxx22 changed to std::fopen(), so the build breaks because there is no std::hunspell_fopen_readahead(): /usr/include/c++/v1/fstream:716:20: error: no member named 'hunspell_fopen_readahead' in namespace 'std'; did you mean simply 'hunspell_fopen_readahead'? 716 | return __do_open(std::fopen(__s, __mdstr), __mode);

see https://www.seamonkey-project.org/releases/seamonkey2.53.24/#new update the jumbo patch from #1896958 (again) to build with recent rust