Add NetBSD support

Source/Core/Core/HW/EXI/EXI_DeviceEthernet.h

@@ -383,7 +383,7 @@ private:
     bool m_bba_link_up = false;
     bool m_bba_failure_notified = false;
 #if defined(WIN32) || defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) ||          \
-    defined(__OpenBSD__)
+    defined(__OpenBSD__) || defined(__NetBSD__)
     sf::UdpSocket m_sf_socket;
     sf::IpAddress m_sf_recipient_ip;
     char m_in_frame[9004];

Source/Core/Core/IOS/Network/Socket.h

@@ -15,7 +15,8 @@ typedef pollfd pollfd_t;
 #define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
 #define FREE(x) HeapFree(GetProcessHeap(), 0, (x))
 
-#elif defined(__linux__) or defined(__APPLE__) or defined(__FreeBSD__) or defined(__HAIKU__)
+#elif defined(__linux__) or defined(__APPLE__) or defined(__FreeBSD__) or defined(__NetBSD__) or   \
+    defined(__HAIKU__)
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <sys/ioctl.h>

Source/Core/Core/MemTools.cpp

@@ -17,7 +17,7 @@
 #include "Core/MachineContext.h"
 #include "Core/PowerPC/JitInterface.h"
 
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__NetBSD__)
 #include <signal.h>
 #endif
 #ifndef _WIN32