rust178: turn off thread local storage for NetBSD/aarch64*.

NetBSD aarch64 has a bug in the thread-local storage implementation,
ref. http://gnats.netbsd.org/58154, and this is responsible for the
build misery experienced earlier, ref.
rust-lang/rust#123551
Therefore: turn it off for now on arm64.

Ideally one could check whether the specific OS version has the fix
or not, but e.g. __NetBSD_Version__ isn't easily available here
that I know, and this goes against the pattern that OS version
should not matter as long as it's >= supported version.
So until the fix for NetBSD PR#58154 has propagated to NetBSD
releases, and the old ones are no longer supported for pkgsrc
(which is going to take a while), this is what we do.

rust178/distinfo

@@ -112,6 +112,8 @@ SHA1 (patch-compiler_rustc__codegen__ssa_src_back_linker.rs) = 6c8f8bbacc544b63b
 SHA1 (patch-compiler_rustc__llvm_build.rs) = a4a66d449fc9eb99d648d02a041778a68f4f7ce8
 SHA1 (patch-compiler_rustc__target_src_spec_base_netbsd.rs) = 7d910631f49acf2c33fdd191fd3e0f261efae234
 SHA1 (patch-compiler_rustc__target_src_spec_mod.rs) = a22b5d28997ed9a5565deec9c34322165d563d00
+SHA1 (patch-compiler_rustc__target_src_spec_targets_aarch64__be__unknown__netbsd.rs) = b0a26945a8640d53eabca16c27c99fc27c8e5623
+SHA1 (patch-compiler_rustc__target_src_spec_targets_aarch64__unknown__netbsd.rs) = bd4f1086033ab21160f1edba1d255ffb4451cbcf
 SHA1 (patch-compiler_rustc__target_src_spec_targets_mips64el__unknown__netbsd.rs) = e97b7978cc525db7eadf967d51f4818a3c145754
 SHA1 (patch-library_backtrace_src_symbolize_gimli.rs) = 1ab343595e65ff6348f83cffc30e53d764485ff8
 SHA1 (patch-library_backtrace_src_symbolize_gimli_elf.rs) = 3b84a462c6bc8245d579452e4c37e3ce13314952

rust178/patches/patch-compiler_rustc__target_src_spec_targets_aarch64__be__unknown__netbsd.rs

@@ -0,0 +1,24 @@
+$NetBSD$
+
+NetBSD aarch64 has a bug in the thread-local storage implementation,
+ref. http://gnats.netbsd.org/58154, and this is responsible for the
+build misery experienced earlier, ref.
+https://github.com/rust-lang/rust/issues/123551
+Turn it off for now on arm64.
+Ideally should check whether the specific OS version has the fix
+or not, but e.g. __NetBSD_Version__ isn't easily available here
+that I know, and this goes against the attitude that OS version
+should matter as long as it's >= supported version.
+So until the fix for NetBSD PR#58154 has propagated to releases,
+this is what we do.
+
+--- compiler/rustc_target/src/spec/targets/aarch64_be_unknown_netbsd.rs.orig	2024-07-23 19:21:34.344805113 +0000
++++ compiler/rustc_target/src/spec/targets/aarch64_be_unknown_netbsd.rs
+@@ -18,6 +18,7 @@ pub fn target() -> Target {
+             max_atomic_width: Some(128),
+             stack_probes: StackProbeType::Inline,
+             endian: Endian::Big,
++            has_thread_local: false, // ref. NetBSD PR#58154
+             ..base::netbsd::opts()
+         },
+     }

rust178/patches/patch-compiler_rustc__target_src_spec_targets_aarch64__unknown__netbsd.rs

@@ -0,0 +1,24 @@
+$NetBSD$
+
+NetBSD aarch64 has a bug in the thread-local storage implementation,
+ref. http://gnats.netbsd.org/58154, and this is responsible for the
+build misery experienced earlier, ref.
+https://github.com/rust-lang/rust/issues/123551
+Turn it off for now on arm64.
+Ideally should check whether the specific OS version has the fix
+or not, but e.g. __NetBSD_Version__ isn't easily available here
+that I know, and this goes against the attitude that OS version
+should matter as long as it's >= supported version.
+So until the fix for NetBSD PR#58154 has propagated to releases,
+this is what we do.
+
+--- compiler/rustc_target/src/spec/targets/aarch64_unknown_netbsd.rs.orig	2024-07-23 19:18:44.116841966 +0000
++++ compiler/rustc_target/src/spec/targets/aarch64_unknown_netbsd.rs
+@@ -17,6 +17,7 @@ pub fn target() -> Target {
+             mcount: "__mcount".into(),
+             max_atomic_width: Some(128),
+             stack_probes: StackProbeType::Inline,
++            has_thread_local: false, // ref. NetBSD PR#58154
+             ..base::netbsd::opts()
+         },
+     }