libupnp: add back autoreconf

Fixes compilation under Arch Linux as it tries to link to host
libraries.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/libupnp/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libupnp
 PKG_VERSION:=1.14.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=@SF/pupnp
@@ -13,6 +13,7 @@ PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=COPYING
 PKG_CPE_ID:=cpe:/a:libupnp_project:libupnp
 
+PKG_FIXUP:=autoreconf
 PKG_INSTALL:=1
 PKG_BUILD_PARALLEL:=1