libxslt: add autoreconf to fix compilation

Arch Linux fails to compile without it as it tries to link to host
libraries.

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

libs/libxslt/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libxslt
 PKG_VERSION:=1.1.34
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:= \
@@ -22,6 +22,7 @@ PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=COPYING
 PKG_CPE_ID:=cpe:/a:xmlsoft:libxslt
 
+PKG_FIXUP:=autoreconf
 PKG_INSTALL:=1
 PKG_BUILD_PARALLEL:=1
 HOST_BUILD_DEPENDS:=libxml2/host