Cleanup: fix names of recipe and patch files.

* this fixes the wrong recipe names introduced by myself in #d525fee
* adjust patch names to match corresponding recipes
* additionally: create 'additional-files' folders as hint to some
  ports that do not have a proper recipe yet

media-libs/sdl_gfx/sdl_gfx-2.0.20.recipe

@@ -0,0 +1,29 @@
+DESCRIPTION="SDL_gfx - SDL graphics drawing primitives and other support functions" 
+HOMEPAGE="http://www.ferzkopp.net/joomla/content/view/19/14/" 
+SRC_URI="http://www.ferzkopp.net/Software/SDL_gfx-2.0/SDL_gfx-2.0.20.tar.gz"
+CHECKSUM_MD5="8a787e538a8e4d80d4927535be5af083"
+REVISION="1"
+STATUS_HAIKU="stable"
+DEPEND="media-libs/libsdl >= 1.2.14"
+BUILD()
+{
+	cd SDL_gfx-2.0.20
+	libtoolize --force --copy --install
+	aclocal
+	autoconf
+	automake
+	MANDIR=`finddir B_COMMON_DOCUMENTATION_DIRECTORY`/man
+	LIBDIR=`finddir B_COMMON_LIB_DIRECTORY`
+	./configure --prefix=`finddir B_COMMON_DIRECTORY` \
+		--libdir=$LIBDIR \
+		--mandir=$MANDIR
+	make
+}
+
+INSTALL()
+{
+	cd SDL_gfx-2.0.20
+	make install
+}
+LICENSE="GNU LGPL v2.1"
+COPYRIGHT="1999-2009 A. Schiffler"