erlang-p1-xml: Fix host dependencies variable name

This should fix the error reported by autobuild:
http://autobuild.buildroot.net/results/63c/63c63b2578e9f6ad71cbea82b987c128305cdab4/

Signed-off-by: Johan Oudinet <johan.oudinet@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/erlang-p1-xml/erlang-p1-xml.mk

@@ -9,7 +9,7 @@ ERLANG_P1_XML_SITE = $(call github,processone,fast_xml,$(ERLANG_P1_XML_VERSION))
 ERLANG_P1_XML_LICENSE = Apache-2.0
 ERLANG_P1_XML_LICENSE_FILES = LICENSE.txt
 ERLANG_P1_XML_DEPENDENCIES = expat erlang-p1-utils
-ERLANG_P1_XML_HOST_DEPENDENCIES = host-expat host-erlang-p1-utils
+HOST_ERLANG_P1_XML_DEPENDENCIES = host-expat host-erlang-p1-utils
 ERLANG_P1_XML_INSTALL_STAGING = YES
 
 ERLANG_P1_XML_USE_AUTOCONF = YES