Keep downloaded files in a separate directory

As a side effect, this re-enables building the Windows installer on Linux hosts.

thirdparty/configure-linux-native-deps.sh

@@ -27,19 +27,4 @@ if [ "$os" == 'Linux' ]; then
 		sed "s/@LIBLUA51@/${liblua51}/" thirdparty/Eluant.dll.config.in > Eluant.dll.config
 		echo "Eluant.dll.config has been created successfully."
 	fi
-elif [ "$os" == 'Darwin' ]; then
-	if [ ! -f libSDL2.dylib ]; then
-		echo "Fetching OS X SDL2 library from GitHub."
-		curl -LOs https://raw.githubusercontent.com/OpenRA/OpenRALauncherOSX/master/dependencies/libSDL2.dylib
-	fi
-
-	if [ ! -f liblua.5.1.dylib ]; then
-		echo "Fetching OS X Lua 5.1 library from GitHub."
-		curl -LOs https://raw.githubusercontent.com/OpenRA/OpenRALauncherOSX/master/dependencies/liblua.5.1.dylib
-	fi
-
-	if [ ! -f Eluant.dll.config ]; then
-		echo "Fetching OS X Lua configuration file from GitHub."
-		curl -LOs https://raw.githubusercontent.com/OpenRA/OpenRALauncherOSX/master/dependencies/Eluant.dll.config
-	fi
 fi

thirdparty/fetch-thirdparty-deps-osx.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+download_dir="${0%/*}/download/osx"
+mkdir -p "$download_dir"
+cd "$download_dir"
+
+if [ ! -f libSDL2.dylib ]; then
+	echo "Fetching OS X SDL2 library from GitHub."
+	curl -LOs https://raw.githubusercontent.com/OpenRA/OpenRALauncherOSX/master/dependencies/libSDL2.dylib
+fi
+
+if [ ! -f liblua.5.1.dylib ]; then
+	echo "Fetching OS X Lua 5.1 library from GitHub."
+	curl -LOs https://raw.githubusercontent.com/OpenRA/OpenRALauncherOSX/master/dependencies/liblua.5.1.dylib
+fi
+
+if [ ! -f Eluant.dll.config ]; then
+	echo "Fetching OS X Lua configuration file from GitHub."
+	curl -LOs https://raw.githubusercontent.com/OpenRA/OpenRALauncherOSX/master/dependencies/Eluant.dll.config
+fi

thirdparty/fetch-thirdparty-deps-windows.sh

@@ -3,34 +3,39 @@
 # Die on any error for Travis CI to automatically retry:
 set -e
 
-if [ ! -d windows ]; then
-	mkdir windows
-fi
+download_dir="${0%/*}/download/windows"
 
-if [ ! -f windows/SDL2.dll ]; then
+mkdir -p "${download_dir}"
+cd "${download_dir}"
+
+if [ ! -f SDL2.dll ]; then
 	echo "Fetching SDL2 from nuget"
 	nuget install sdl2 -Version 2.0.3 -ExcludeVersion
-	cp ./sdl2.redist/build/native/bin/Win32/dynamic/SDL2.dll ./windows/
+	cp ./sdl2.redist/build/native/bin/Win32/dynamic/SDL2.dll .
 	rm -rf sdl2 sdl2.redist
 fi
 
-if [ ! -f windows/freetype6.dll ]; then
+if [ ! -f freetype6.dll ]; then
 	echo "Fetching FreeType2 from nuget"
 	nuget install SharpFont.Dependencies -Version 2.5.5.1 -ExcludeVersion
-	cp ./SharpFont.Dependencies/bin/msvc10/x86/freetype6.dll ./windows/
+	cp ./SharpFont.Dependencies/bin/msvc10/x86/freetype6.dll .
 	rm -rf SharpFont.Dependencies
 fi
 
-if [ ! -f windows/lua51.dll ]; then
+if [ ! -f lua51.dll ]; then
 	echo "Fetching Lua 5.1 from nuget"
 	nuget install lua.binaries -Version 5.1.5 -ExcludeVersion
-	cp ./lua.binaries/bin/win32/dll8/lua5.1.dll ./windows/lua51.dll
+	cp ./lua.binaries/bin/win32/dll8/lua5.1.dll ./lua51.dll
 	rm -rf lua.binaries
 fi
 
-if [ ! -f windows/soft_oal.dll ]; then
+if [ ! -f soft_oal.dll ]; then
 	echo "Fetching OpenAL Soft from nuget"
 	nuget install OpenAL-Soft -Version 1.16.0 -ExcludeVersion
-	cp ./OpenAL-Soft/bin/Win32/soft_oal.dll windows/soft_oal.dll
+	cp ./OpenAL-Soft/bin/Win32/soft_oal.dll ./soft_oal.dll
 	rm -rf OpenAL-Soft
 fi
+
+if [ ! -f ../NsProcess.zip ]; then
+	curl -s -L -o ../NsProcess.zip http://nsis.sourceforge.net/mediawiki/images/archive/1/18/20140806212030!NsProcess.zip
+fi

thirdparty/fetch-thirdparty-deps.ps1

@@ -1,4 +1,6 @@
-mkdir windows -Force >$null
+mkdir download/windows -Force >$null
+
+cd download
 
 if (!(Test-Path "nuget.exe"))
 {
@@ -127,3 +129,5 @@ if (!(Test-Path "Eluant.dll"))
 	$target = Join-Path $pwd.ToString() "Eluant.dll"
 	(New-Object System.Net.WebClient).DownloadFile("https://github.com/OpenRA/Eluant/releases/download/20140425/Eluant.dll", $target)
 }
+
+cd ..

thirdparty/fetch-thirdparty-deps.sh

@@ -3,6 +3,11 @@
 # Die on any error for Travis CI to automatically retry:
 set -e
 
+download_dir="${0%/*}/download"
+
+mkdir -p "${download_dir}"
+cd "${download_dir}"
+
 if [ ! -f StyleCopPlus.dll ]; then
 	echo "Fetching StyleCopPlus from nuget"
 	nuget install StyleCopPlus.MSBuild -Version 4.7.49.5 -ExcludeVersion