libsigsegv: Add Aarch64 patch

pkgs/development/libraries/libsigsegv/aarch64.patch

@@ -0,0 +1,12 @@
+diff --git a/configure b/configure
+index 6c4e868..0298e19 100755
+--- a/configure
++++ b/configure
+@@ -14501,6 +14501,7 @@ else
+ 
+     case "$host_cpu" in
+             a29k | \
++      aarch64* | \
+       alpha* | \
+       arc | \
+       arm* | strongarm* | xscale* | \

pkgs/development/libraries/libsigsegv/default.nix

@@ -8,6 +8,12 @@ stdenv.mkDerivation rec {
     sha256 = "16hrs8k3nmc7a8jam5j1fpspd6sdpkamskvsdpcw6m29vnis8q44";
   };
 
+  # Based on https://github.com/davidgfnet/buildroot-Os/blob/69fe6065b9dd1cb4dcc0a4b554e42cc2e5bd0d60/package/libsigsegv/libsigsegv-0002-fix-aarch64-build.patch
+  # but applied directly to configure since we can't use autoreconf while bootstrapping.
+  patches = if stdenv.isAarch64 || stdenv.cross.arch or "" == "aarch64"
+    then [ ./aarch64.patch ]
+    else null; # TODO: change to lib.optional on next mass rebuild
+
   # https://github.com/NixOS/nixpkgs/issues/6028
   doCheck = false;