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

dev-libs/xerces_c/xerces_c-3.1.1.recipe

@@ -0,0 +1,26 @@
+DESCRIPTION="Xerces-C++ is a validating XML parser written in a portable subset of C++" 
+HOMEPAGE="http://xerces.apache.org/xerces-c/" 
+SRC_URI="http://mirror.pop-sc.rnp.br/apache//xerces/c/3/sources/xerces-c-3.1.1.tar.gz"
+CHECKSUM_MD5="6a8ec45d83c8cfb1584c5a5345cb51ae"
+REVISION="1"
+STATUS_HAIKU="stable"
+DEPEND="dev-util/pkgconfig >= 0.23"
+
+BUILD()
+{
+	cd xerces-c-3.1.1
+	libtoolize --copy --force --install
+	autoreconf -i
+	./configure --prefix=`finddir B_COMMON_DIRECTORY`
+	make
+}
+
+INSTALL()
+{
+	cd xerces-c-3.1.1
+	make install
+}
+
+LICENSE="Apache v2"
+COPYRIGHT="1999 IBM Corporation
+	1999-2010 The Apache Software Foundation"