File use-system-libraries-in-node.patch of Package nodejs-electron

Also remove spurious exports of internal functions bloating binary due to incorrectly building libnode with -fvisibility=default
Both this and the unbundle flags should be upstreamed but probably separately.

--- src/third_party/electron_node/node.gni.orig	2025-04-20 10:49:28.656330018 +0200
+++ src/third_party/electron_node/node.gni	2025-04-20 19:08:01.482693254 +0200
@@ -73,10 +73,12 @@ declare_args() {
   node_use_amaro = true
 
   # Allows downstream packagers (eg. Linux distributions) to build against system shared libraries.
+  use_system_ada = false
   use_system_cares = false
   use_system_nghttp2 = false
   use_system_llhttp = false
   use_system_histogram = false
+  use_system_simdjson = false
 }
 
 assert(!node_enable_inspector || node_use_openssl,
--- src/third_party/electron_node/unofficial.gni.orig	2025-05-14 23:39:11.439896657 +0200
+++ src/third_party/electron_node/unofficial.gni	2025-05-15 00:49:20.743843435 +0200
@@ -9,6 +9,35 @@ import("$node_v8_path/gni/v8.gni")
 # The actual configurations are put inside a template in unofficial.gni to
 # prevent accidental edits from contributors.
 template("node_gn_build") {
+    if (is_linux) {
+    import("//build/config/linux/pkg_config.gni")
+    if (use_system_cares) {
+      pkg_config("system_cares") {
+        packages = [ "libcares" ]
+      }
+    }
+    if (use_system_histogram) {
+      pkg_config("system_histogram") {
+        packages = [ "hdr_histogram" ]
+      }
+    }
+    if (use_system_llhttp) {
+      pkg_config("system_llhttp") {
+        packages = [ "libllhttp" ]
+      }
+    }
+    if (use_system_nghttp2) {
+      pkg_config("system_nghttp2") {
+        packages = [ "libnghttp2" ]
+      }
+    }
+    if (use_system_simdjson) {
+      pkg_config("system_simdjson") {
+        packages = [ "simdjson" ]
+      }
+    }
+  }
+
   config("node_features") {
     defines = []
     if (is_component_build) {
@@ -139,24 +168,20 @@ template("node_gn_build") {
 
   source_set("libnode") {
     configs += [ ":node_internal_config" ]
+    libs = []
     public_configs = [
       ":node_external_config",
       "deps/googletest:googletest_config",
       ":zstd_include_config"
     ]
     public_deps = [
-      "deps/ada",
       "deps/uv",
       "//electron:electron_js2c",
-      "deps/simdjson",
       "$node_v8_path",
     ]
     deps = [
       ":run_node_js2c",
-      "deps/cares",
-      "deps/histogram",
       "deps/nbytes",
-      "deps/nghttp2",
       "deps/postject",
       "deps/sqlite",
       "deps/uvwasi",
@@ -186,21 +211,36 @@ template("node_gn_build") {
         "Security.framework",
       ]
     }
-    if (is_posix) {
-      configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
-      configs += [ "//build/config/gcc:symbol_visibility_default" ]
+    if (use_system_ada) {
+      libs += ["ada"]
+    } else {
+      public_deps += [ "deps/ada" ]
+    }
+    if (use_system_cares) {
+      configs += [ ":system_cares" ]
+    } else {
+      deps += [ "deps/cares" ]
     }
     if (use_system_llhttp) {
-      libs += [ "llhttp" ]
+      configs += [ ":system_llhttp" ]
     } else {
       deps += [ "deps/llhttp" ]
     }
     if (use_system_histogram) {
-      libs += [ "hdr_histogram" ]
-      include_dirs += [ "/usr/include/hdr" ]
+      configs += [":system_histogram"]
     } else {
       deps += [ "deps/histogram" ]
     }
+    if (use_system_nghttp2) {
+      configs += [":system_nghttp2"]
+    } else {
+      deps += [ "deps/nghttp2" ]
+    }
+    if (use_system_simdjson) {
+      public_configs += [":system_simdjson"]
+    } else {
+      public_deps += [ "deps/simdjson" ]
+    }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
@@ -229,19 +269,6 @@ template("node_gn_build") {
       sources += node_inspector.node_inspector_sources +
                  node_inspector.node_inspector_generated_sources
     }
-    if (is_linux) {
-      import("//build/config/linux/pkg_config.gni")
-        if (use_system_cares) {
-          pkg_config("cares") {
-            packages = [ "libcares" ]
-          }
-        }
-      if (use_system_nghttp2) {
-        pkg_config("nghttp2") {
-          packages = [ "libnghttp2" ]
-        }
-      }
-    }
   }
 
   config("zstd_include_config") {
@@ -435,11 +462,13 @@ template("node_gn_build") {
     ]
 
     sources = [ "src/node_snapshot_stub.cc" ]
+    if(false) { #Test only target, not sure why it breaks gn
     sources += exec_script("./tools/search_files.py",
                            [ rebase_path(".", root_build_dir),
                              rebase_path("test/cctest", root_build_dir),
                              "cc" ],
                            "list lines")
+    }
 
     if (node_use_openssl) {
       deps += [ "deps/ncrypto" ]