libxml2: Fix develop/lib paths

* Replace $libDir by $developLibDir in xml2Conf.sh and xml2-config.
* Make with multiple jobs.

dev-libs/libxml2/patches/libxml2-2.8.0.patch

@@ -24,3 +24,26 @@ diff -ur libxml2-2.8.0.orig/Makefile.am libxml2-2.8.0/Makefile.am
  EXAMPLES_DIR=$(BASE_DIR)/$(DOC_MODULE)/examples
  
  install-data-local: 
+diff -ur orig/libxml2-2.8.0/xml2-config.in libxml2-2.8.0/xml2-config.in
+--- orig/libxml2-2.8.0/xml2-config.in	2009-07-30 17:24:35.050855936 +0200
++++ libxml2-2.8.0/xml2-config.in	2013-04-30 18:29:36.158072832 +0200
+@@ -40,8 +40,8 @@
+     case "$1" in
+     --prefix=*)
+ 	prefix=$optarg
+-	includedir=$prefix/include
+-	libdir=$prefix/lib
++	includedir=$prefix/develop/headers
++	libdir=$prefix/develop/lib
+ 	;;
+ 
+     --prefix)
+@@ -50,7 +50,7 @@
+ 
+     --exec-prefix=*)
+       exec_prefix=$optarg
+-      libdir=$exec_prefix/lib
++      libdir=$exec_prefix/develop/lib
+       ;;
+ 
+     --exec-prefix)