fetch SDL2 (native Windows DLL) from nuget

.gitignore

@@ -30,6 +30,7 @@ thirdparty/Newtonsoft.Json*
 thirdparty/SharpFont*
 thirdparty/windows/freetype6.dll
 thirdparty/nunit*
+thirdparty/windows/SDL2.dll
 
 # backup files by various editors
 *~

thirdparty/fetch-thirdparty-deps.ps1

@@ -51,3 +51,12 @@ if (!(Test-Path "nunit.framework.dll"))
 	cp NUnit.2.6.4/lib/nunit.framework* .
 	rmdir NUnit.2.6.4 -Recurse
 }
+
+if (!(Test-Path "windows/SDL2.dll"))
+{
+	echo "Fetching SDL2 from NuGet."
+	./nuget.exe install sdl2 -Version 2.0.3
+	cp sdl2.redist.2.0.3/build/native/bin/Win32/dynamic/SDL2.dll ./windows/
+	rmdir sdl2.2.0.3 -Recurse
+	rmdir sdl2.redist.2.0.3 -Recurse
+}

thirdparty/fetch-thirdparty-deps.sh

@@ -41,3 +41,10 @@ if [ ! -f nunit.framework.dll ]; then
 	cp ./NUnit.2.6.4/lib/nunit.framework* .
 	rm -rf NUnit.2.6.4
 fi
+
+if [ ! -f windows/SDL2.dll ]; then
+	echo "Fetching SDL2 from nuget"
+	nuget install sdl2 -Version 2.0.3
+	cp ./sdl2.redist.2.0.3/build/native/bin/Win32/dynamic/SDL2.dll ./windows/
+	rm -rf sdl2.2.0.3 sdl2.redist.2.0.3
+fi