Android: Ask for the local network permission for ad hoc, UPnP and servers

Part of #21585

Android 17 blocks LAN traffic in both directions (TCP and UDP, including
broadcast and multicast) without ACCESS_LOCAL_NETWORK. Ask for it when
networking, the built-in ad hoc server, UPnP, share-on-startup or the
remote debugger gets turned on, when a game initializes ad hoc with
networking enabled, and at startup if a server is set to start then.

A denied ad hoc send fails with EPERM, which the games never see, so show
a message for it.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

UI/DeveloperToolsScreen.cpp

@@ -21,6 +21,7 @@
 #include "Common/UI/View.h"
 #include "Common/UI/ViewGroup.h"
 #include "Common/System/OSD.h"
+#include "Common/System/Request.h"
 #include "Common/GPU/OpenGL/GLFeatures.h"
 #include "Common/Data/Text/Parsers.h"
 #include "Common/Data/Encoding/Utf8.h"
@@ -736,6 +737,8 @@ void DeveloperToolsScreen::OnCopyStatesToRoot(UI::EventParams &e) {
 
 void DeveloperToolsScreen::OnRemoteDebugger(UI::EventParams &e) {
 	if (allowDebugger_) {
+		// Only needed for connecting from another device, but that's the usual case.
+		System_RequestLocalNetworkPermission();
 		StartWebServer(WebServerFlags::DEBUGGER);
 	} else {
 		StopWebServer(WebServerFlags::DEBUGGER);