curl: fixes for static linking on Darwin (#346950)

pkgs/tools/networking/curl/default.nix

@@ -82,6 +82,12 @@ stdenv.mkDerivation (finalAttrs: {
 
   strictDeps = true;
 
+  env = lib.optionalAttrs (stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isStatic) {
+    # Not having this causes curl’s `configure` script to fail with static builds on Darwin because
+    # some of curl’s propagated inputs need libiconv.
+    NIX_LDFLAGS = "-liconv";
+  };
+
   nativeBuildInputs = [ pkg-config perl ];
 
   # Zlib and OpenSSL must be propagated because `libcurl.la' contains
@@ -228,7 +234,7 @@ stdenv.mkDerivation (finalAttrs: {
     maintainers = with lib.maintainers; [ lovek323 ];
     platforms = lib.platforms.all;
     # Fails to link against static brotli or gss
-    broken = stdenv.hostPlatform.isStatic && (brotliSupport || gssSupport || stdenv.hostPlatform.system == "x86_64-darwin");
+    broken = stdenv.hostPlatform.isStatic && (brotliSupport || gssSupport);
     pkgConfigModules = [ "libcurl" ];
     mainProgram = "curl";
   };