Log Message:
lang/rust: pull over fixes to rust 1.79 from pkgsrc-wip:

1) Turn off the use ot thread local storage on NetBSD/aarch64,
   due to NetBSD PR#58154 and our desire to support systems
   built before the fix was applied.
2) Use the fixed 1.78.0 bootstrap for NetBSD/aarch64 (which
   is now built with the workaround from #1 applied).
3) Reinstate the patches to the openssl-sys and openssl-src
   vendor crates, and their checksum fixes, taken from pkgsrc-wip
   rust 1.78.0 and adapted.
4) Make the NetBSD/sparc64 target spec more similar to the other
   sparc64 targets.  Does not resolve the cross-build problem, sadly.