sdl2: Update to SDL 2.0.12 (#2469)

* Bump sdl2 to 2.0.12

* Adapt sdl2-1-fixes.patch to changes made in SDL 2.0.12

src/sdl2-1-fixes.patch

@@ -48,9 +48,9 @@ index 1111111..2222222 100644
 -VERSION_OBJECTS=`echo "$VERSION_OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.rc,$(objects)/\1.o,g'`
 +VERSION_OBJECTS=`echo "$VERSION_OBJECTS" | sed 's,[[^ ]]*/\([[^ ]]*\)\.rc,$(objects)/\1.lo,g'`
  VERSION_DEPENDS=`echo "$VERSION_DEPENDS" | sed "s,\\([[^ ]]*\\)/\\([[^ ]]*\\)\\.rc,\\\\
--\\$(objects)/\\2.o: \\1/\\2.rc\\\\
+-\\$(objects)/\\2.o: \\1/\\2.rc \\$(objects)/.created\\\\
 -	\\$(WINDRES) \\$< \\$@,g"`
-+\\$(objects)/\\2.lo: \\1/\\2.rc\\\\
++\\$(objects)/\\2.lo: \\1/\\2.rc \\$(objects)/.created\\\\
 +	\\$(LIBTOOL) --mode=compile --tag=RC \\$(WINDRES) -i \\$< -o \\$@,g"`
  
  SDLMAIN_OBJECTS=`echo $SDLMAIN_SOURCES`

src/sdl2.mk

@@ -4,8 +4,8 @@ PKG             := sdl2
 $(PKG)_WEBSITE  := https://www.libsdl.org/
 $(PKG)_DESCR    := SDL2
 $(PKG)_IGNORE   :=
-$(PKG)_VERSION  := 2.0.10
-$(PKG)_CHECKSUM := b4656c13a1f0d0023ae2f4a9cf08ec92fffb464e0f24238337784159b8b91d57
+$(PKG)_VERSION  := 2.0.12
+$(PKG)_CHECKSUM := 349268f695c02efbc9b9148a70b85e58cefbbf704abd3e91be654db7f1e2c863
 $(PKG)_SUBDIR   := SDL2-$($(PKG)_VERSION)
 $(PKG)_FILE     := SDL2-$($(PKG)_VERSION).tar.gz
 $(PKG)_URL      := https://www.libsdl.org/release/$($(PKG)_FILE)