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_net/sdl_net-1.2.8.recipe

@@ -0,0 +1,29 @@
+DESCRIPTION="Simple Direct Media Layer Net Library" 
+HOMEPAGE="http://www.libsdl.org/projects/SDL_net" 
+SRC_URI="http://www.libsdl.org/projects/SDL_net/release/SDL_net-1.2.8.tar.gz"
+CHECKSUM_MD5="20e64e61d65662db66c379034f11f718"
+REVISION="1"
+STATUS_HAIKU="stable"
+DEPEND=""
+BUILD()
+{
+	cd SDL_net-1.2.8
+	aclocal --force --install -I acinclude
+	libtoolize -fci
+	./autogen.sh
+	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_net-1.2.8
+	make install
+}
+
+LICENSE="Zlib"
+COPYRIGHT="1997-2012 Sam Lantinga"