network: hide miniupnpc behind a #def. use static buffer for udp data

core/build.h

@@ -211,6 +211,8 @@
 #define HOST_64BIT_CPU
 #endif
 
+#define USE_MINIUPNPC
+
 // Compiler Related
 
 #ifndef _MSC_VER

core/network/miniupnp.cpp

@@ -16,6 +16,8 @@
     You should have received a copy of the GNU General Public License
     along with Flycast.  If not, see <https://www.gnu.org/licenses/>.
 */
+#include "build.h"
+#ifdef USE_MINIUPNPC
 #include <miniupnpc.h>
 #include <upnpcommands.h>
 #include "types.h"
@@ -79,3 +81,4 @@ bool MiniUPnP::AddPortMapping(int port, bool tcp)
 	mappedPorts.emplace_back(portStr, tcp);
 	return true;
 }
+#endif

core/network/miniupnp.h

@@ -19,6 +19,7 @@
 #pragma once
 #include <vector>
 #include <utility>
+#ifdef USE_MINIUPNPC
 #include <miniupnpc/miniupnpc.h>
 
 class MiniUPnP
@@ -44,3 +45,16 @@ private:
 	std::vector<std::pair<std::string, bool>> mappedPorts;
 };
 
+#else
+
+class MiniUPnP
+{
+public:
+	bool Init() { return true; }
+	void Term() {}
+	bool AddPortMapping(int port, bool tcp) { return true; }
+	const char *localAddress() const { return ""; }
+	const char *externalAddress() const { return ""; }
+};
+
+#endif

core/network/picoppp.cpp

@@ -616,7 +616,7 @@ static void read_native_sockets()
 		}
 	}
 
-	char buf[1500];
+	static char buf[1500];
 	pico_msginfo msginfo;
 
 	// Read UDP sockets