Add sdl2_image package (#3018)

packages/sdl2_image.rb

+require 'package'
+
+class Sdl2_image < Package
+  description 'SDL2_image is an image loading library that is used with the SDL2 library.'
+  homepage 'https://www.libsdl.org/projects/SDL_image/'
+  version '2.0.4'
+  source_url 'https://www.libsdl.org/projects/SDL_image/release/SDL2_image-2.0.4.tar.gz'
+  source_sha256 'e74ec49c2402eb242fbfa16f2f43a19582a74c2eabfbfb873f00d4250038ceac'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'libsdl2'
+  depends_on 'libjpeg'
+  depends_on 'libpng'
+  depends_on 'libtiff'
+  depends_on 'libwebp'
+
+  def self.build
+    system './configure',
+           "--prefix=#{CREW_PREFIX}",
+           "--libdir=#{CREW_LIB_PREFIX}"
+    system 'make'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end