fix dependencies

package/libxml2/Makefile

@@ -10,7 +10,8 @@ PKG_MD5SUM:=		9c0cfef285d5c4a5c80d00904ddab380
 PKG_DESCR:=		XML C parser and toolkit
 PKG_SECTION:=		libs
 PKG_DEPENDS:=		zlib
-PKG_BUILDDEP:=		autotool gettext-tiny bzip2-host python2-host libxml2-host zlib
+PKG_BUILDDEP:=		libxml2-host zlib
+HOST_BUILDDEP:=		python2-host
 PKG_URL:=		http://www.xmlsoft.org/
 PKG_SITES:=		http://xmlsoft.org/sources/
 PKG_OPTS:=		dev