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/libwebp/libwebp-0.1.2_git.recipe

@@ -0,0 +1,23 @@
+DESCRIPTION="library for encoding and decoding WebP image files"
+HOMEPAGE="http://code.google.com/p/webp"
+SRC_URI="git+git://review.webmproject.org/libwebp.git"
+REVISION="1"
+STATUS_HAIKU="stable"
+DEPEND=""
+BUILD()
+{
+	cd libwebp-0.1.2-git
+	./autogen.sh
+	./configure --prefix=`finddir B_COMMON_DIRECTORY` \
+		--mandir=`finddir B_COMMON_DOCUMENTATION_DIRECTORY`/man
+	make
+}
+	
+INSTALL()
+{
+	cd libwebp-0.1.2-git
+	make install
+}
+
+LICENSE="BSD (3-clause)"
+COPYRIGHT="2011 Google Inc."