Remove SDL2 package from aports (#640)

Now that SDL2 2.0.6 is out and updated in Alpine, there's no reason for
us to keep this package around, at least from an osk-sdl perspective!

main/sdl2/0001-fix-c90-errors.patch

@@ -1,28 +0,0 @@
-diff --git a/src/video/directfb/SDL_DirectFB_shape.c b/src/video/directfb/SDL_DirectFB_shape.c
-index 3239e30..e3d4dcd 100644
---- a/src/video/directfb/SDL_DirectFB_shape.c
-+++ b/src/video/directfb/SDL_DirectFB_shape.c
-@@ -37,18 +37,20 @@ DirectFB_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsi
- SDL_WindowShaper*
- DirectFB_CreateShaper(SDL_Window* window) {
-     SDL_WindowShaper* result = NULL;
--
-+    SDL_ShapeData* data = NULL;
-+    int resized_properly = 0;
-+    
-     result = malloc(sizeof(SDL_WindowShaper));
-     result->window = window;
-     result->mode.mode = ShapeModeDefault;
-     result->mode.parameters.binarizationCutoff = 1;
-     result->userx = result->usery = 0;
--    SDL_ShapeData* data = SDL_malloc(sizeof(SDL_ShapeData));
-     result->driverdata = data;
-     data->surface = NULL;
-     window->shaper = result;
--    int resized_properly = DirectFB_ResizeWindowShape(window);
-     SDL_assert(resized_properly == 0);
-+    data = SDL_malloc(sizeof(SDL_ShapeData));
-+    resized_properly = DirectFB_ResizeWindowShape(window);
- 
-     return result;
- }

main/sdl2/APKBUILD

@@ -1,69 +0,0 @@
-pkgname=sdl2
-pkgver=9999
-_pkgver=2.0.5
-pkgrel=2
-_pkgname=SDL2
-pkgdesc="A development library designed to provide low level access to audio, keyboard, mouse, joystick and graphics"
-url="http://www.libsdl.org"
-arch="all"
-license="zlib"
-depends="directfb tslib"
-depends_dev="alsa-lib-dev libxcursor-dev libxrandr-dev libxrender-dev mesa-dev directfb-dev tslib-dev"
-makedepends="$depends_dev"
-subpackages="$pkgname-dev"
-source="https://www.libsdl.org/release/$_pkgname-$_pkgver.tar.gz
-	altivec-fixes.patch
-	0001-fix-c90-errors.patch"
-
-builddir="$srcdir/$_pkgname-$_pkgver"
-
-prepare(){
-    cd "$builddir"
-
-    # first apply patches in specified order
-    for i in $source; do
-    	case $i in
-	*.patch)
-		msg "Applying $i..."
-		if ! patch -s -p1 -N -i "$srcdir"/$i; then
-			echo $i >>failed
-			_patch_failed=1
-		fi
-        ;;
-        esac
-    done
-
-    if ! [ -z "$_patch_failed" ]; then
-	error "The following patches failed:"
-	cat failed
-	return 1
-    fi
-
-
-}
-
-build() {
-    cd "$builddir"
-    ./configure \
-    --build=$CBUILD \
-    --host=$CHOST \
-    --prefix=/usr \
-    --enable-alsa \
-    --enable-clock_gettime \
-    --disable-arts \
-    --disable-esd \
-    --disable-nas \
-    --disable-rpath \
-    --with-x \
-    --enable-video-directfb
-    make
-}
-
-package() {
-    cd "$builddir"
-    make DESTDIR="$pkgdir" install || return 1
-}
-
-sha512sums="6401f5df08c08316c09bc6ac5b28345c5184bb25770baa5c94c0a582ae130ddf73bb736e44bb31f4e427c1ddbbeec4755a6a5f530b6b4c3d0f13ebc78ddc1750  SDL2-2.0.5.tar.gz
-aad37129e8d1259fcceea087794aa45f7d94a5b0b09275a72e20ae53809a587f8a59dba05c9bd763012e6471d6d9d87739e282bcbb7df4de5c66d06d9e23d8d3  altivec-fixes.patch
-25dbfa65f15040564f2345c235e8997fcc60e81e03691afcd75b3d5f982941220d4a2b7710de1e40b581b63632f1b667befbc819513a785da01ad40d6ce1ef5f  0001-fix-c90-errors.patch"

main/sdl2/altivec-fixes.patch

@@ -1,36 +0,0 @@
---- SDL2-2.0.5.orig/src/video/SDL_blit_N.c
-+++ SDL2-2.0.5/src/video/SDL_blit_N.c
-@@ -118,12 +118,6 @@
-         16, 8, 0, 24,
-         0, NULL
-     };
--    if (!srcfmt) {
--        srcfmt = &default_pixel_format;
--    }
--    if (!dstfmt) {
--        dstfmt = &default_pixel_format;
--    }
-     const vector unsigned char plus = VECUINT8_LITERAL(0x00, 0x00, 0x00, 0x00,
-                                                        0x04, 0x04, 0x04, 0x04,
-                                                        0x08, 0x08, 0x08, 0x08,
-@@ -132,10 +126,16 @@
-     vector unsigned char vswiz;
-     vector unsigned int srcvec;
- #define RESHIFT(X) (3 - ((X) >> 3))
--    Uint32 rmask = RESHIFT(srcfmt->Rshift) << (dstfmt->Rshift);
--    Uint32 gmask = RESHIFT(srcfmt->Gshift) << (dstfmt->Gshift);
--    Uint32 bmask = RESHIFT(srcfmt->Bshift) << (dstfmt->Bshift);
--    Uint32 amask;
-+    Uint32 rmask, gmask, bmask, amask;
-+    if (!srcfmt) {
-+        srcfmt = &default_pixel_format;
-+    }
-+    if (!dstfmt) {
-+        dstfmt = &default_pixel_format;
-+    }
-+    rmask = RESHIFT(srcfmt->Rshift) << (dstfmt->Rshift);
-+    gmask = RESHIFT(srcfmt->Gshift) << (dstfmt->Gshift);
-+    bmask = RESHIFT(srcfmt->Bshift) << (dstfmt->Bshift);
-     /* Use zero for alpha if either surface doesn't have alpha */
-     if (dstfmt->Amask) {
-         amask =