Upgrade SDL (2.0.20) for Windows

Include the latest version of SDL in Windows releases.

cross_win32.txt

@@ -20,4 +20,4 @@ ffmpeg_avcodec = 'avcodec-58'
 ffmpeg_avformat = 'avformat-58'
 ffmpeg_avutil = 'avutil-56'
 prebuilt_ffmpeg = 'ffmpeg-4.3.1-win32-shared'
-prebuilt_sdl2 = 'SDL2-2.0.18/i686-w64-mingw32'
+prebuilt_sdl2 = 'SDL2-2.0.20/i686-w64-mingw32'

cross_win64.txt

@@ -20,4 +20,4 @@ ffmpeg_avcodec = 'avcodec-59'
 ffmpeg_avformat = 'avformat-59'
 ffmpeg_avutil = 'avutil-57'
 prebuilt_ffmpeg = 'ffmpeg-5.0-full_build-shared'
-prebuilt_sdl2 = 'SDL2-2.0.18/x86_64-w64-mingw32'
+prebuilt_sdl2 = 'SDL2-2.0.20/x86_64-w64-mingw32'

prebuilt-deps/Makefile

@@ -23,9 +23,9 @@ prepare-ffmpeg-win64:
 		ffmpeg-5.0-full_build-shared
 
 prepare-sdl2:
-	@./prepare-dep https://libsdl.org/release/SDL2-devel-2.0.18-mingw.tar.gz \
-		bbad7c6947f6ca3e05292f065852ed8b62f319fc5533047e7708769c4dbae394 \
-		SDL2-2.0.18
+	@./prepare-dep https://libsdl.org/release/SDL2-devel-2.0.20-mingw.tar.gz \
+		38094d82a857d6c62352e5c5cdec74948c5b4d25c59cbd298d6d233568976bd1 \
+		SDL2-2.0.20
 
 prepare-adb:
 	@./prepare-dep https://dl.google.com/android/repository/platform-tools_r31.0.3-windows.zip \

release.mk

@@ -102,7 +102,7 @@ dist-win32: build-server build-win32
 	cp prebuilt-deps/platform-tools/adb.exe "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp prebuilt-deps/platform-tools/AdbWinApi.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp prebuilt-deps/platform-tools/AdbWinUsbApi.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
-	cp prebuilt-deps/SDL2-2.0.18/i686-w64-mingw32/bin/SDL2.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
+	cp prebuilt-deps/SDL2-2.0.20/i686-w64-mingw32/bin/SDL2.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 
 dist-win64: build-server build-win64
 	mkdir -p "$(DIST)/$(WIN64_TARGET_DIR)"
@@ -120,7 +120,7 @@ dist-win64: build-server build-win64
 	cp prebuilt-deps/platform-tools/adb.exe "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp prebuilt-deps/platform-tools/AdbWinApi.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp prebuilt-deps/platform-tools/AdbWinUsbApi.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
-	cp prebuilt-deps/SDL2-2.0.18/x86_64-w64-mingw32/bin/SDL2.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
+	cp prebuilt-deps/SDL2-2.0.20/x86_64-w64-mingw32/bin/SDL2.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
 
 zip-win32: dist-win32
 	cd "$(DIST)/$(WIN32_TARGET_DIR)"; \