fix(pg_net): disable dangling-assignment warning for v0.19.5 on aarch64-darwin

Version 0.19.5 has a dangling pointer issue in src/core.c:177 that causes
compilation to fail on aarch64-darwin with newer clang versions. This adds
-Wno-error=dangling-assignment to allow compilation to proceed.

The flag is restricted to aarch64-darwin only since GCC on Linux doesn't
recognize this warning option.

Author: yvan-sraka

nix/ext/pg_net.nix

@@ -49,7 +49,14 @@ let
           rm sql/pg_net--0.5.1--0.6.sql
         '';
 
-      env.NIX_CFLAGS_COMPILE = lib.optionalString (lib.versionOlder version "0.19.1") "-Wno-error";
+      env.NIX_CFLAGS_COMPILE =
+        if (lib.versionOlder version "0.19.1") then
+          "-Wno-error"
+        else if (version == "0.19.5" && stdenv.isDarwin && stdenv.isAarch64) then
+          # Fix for dangling pointer warning in src/core.c:177 on aarch64-darwin with newer clang
+          "-Wno-error=dangling-assignment"
+        else
+          "";
 
       installPhase = ''
         mkdir -p $out/{lib,share/postgresql/extension}