gnu: Remove sdl2-2.0.

* gnu/packages/sdl.scm (sdl2-2.0): Delete variable.

Fixes: guix/guix#3103
Change-Id: Ide83df514414e9c40d1f3a60735f898958e4788c

gnu/packages/sdl.scm

@@ -292,26 +292,6 @@ behind the scenes.")
 
 (define-public sdl sdl12-compat)
 
-(define-public sdl2-2.0
-  (package
-    (inherit sdl2)
-    (name "sdl2")
-    (version "2.0.14")
-    (source (origin
-              (method url-fetch)
-              (uri
-               (string-append "https://libsdl.org/release/SDL2-"
-                              version ".tar.gz"))
-              (sha256
-               (base32
-                "1g1jahknv5r4yhh1xq5sf0md20ybdw1zh1i15lry26sq39bmn8fq"))))
-    (arguments
-     (substitute-keyword-arguments (package-arguments sdl2)
-       ((#:configure-flags flags)
-        #~(cons*
-           "CFLAGS=-g -O2 -Wno-error=incompatible-pointer-types"
-           #$flags))))))
-
 (define-public libmikmod
   (package
     (name "libmikmod")