windows: Call SetProcessDEPPolicy directly

src/init.cpp

@@ -891,16 +891,7 @@ bool AppInitBasicSetup()
 #endif
 #ifdef WIN32
     // Enable Data Execution Prevention (DEP)
-    // Minimum supported OS versions: WinXP SP3, WinVista >= SP1, Win Server 2008
-    // A failure is non-critical and needs no further attention!
-#ifndef PROCESS_DEP_ENABLE
-    // We define this here, because GCCs winbase.h limits this to _WIN32_WINNT >= 0x0601 (Windows 7),
-    // which is not correct. Can be removed, when GCCs winbase.h is fixed!
-#define PROCESS_DEP_ENABLE 0x00000001
-#endif
-    typedef BOOL (WINAPI *PSETPROCDEPPOL)(DWORD);
-    PSETPROCDEPPOL setProcDEPPol = (PSETPROCDEPPOL)GetProcAddress(GetModuleHandleA("Kernel32.dll"), "SetProcessDEPPolicy");
-    if (setProcDEPPol != nullptr) setProcDEPPol(PROCESS_DEP_ENABLE);
+    SetProcessDEPPolicy(PROCESS_DEP_ENABLE);
 #endif
 
     if (!SetupNetworking())