exo: stop configure detecting host's python

This patch does not cause python bindings builded properly (native headers included)

error message was:
ERROR: This autoconf log indicates errors, it looked at host include and/or library paths while determining system capabilities.
Rerun configure task after fixing this. The path was '/home/andreas/tmp/oe-core-eglibc/work/armv7a-vfp-neon-angstrom-linux-gnueabi/exo-0.6.2-r0/exo-0.6.2'
ERROR: Function failed: do_qa_configure
ERROR: Logfile of failure stored in: /home/andreas/tmp/oe-core-eglibc/work/armv7a-vfp-neon-angstrom-linux-gnueabi/exo-0.6.2-r0/temp/log.do_configure.13932
NOTE: package exo-0.6.2-r0: task do_configure: Failed

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>

meta-xfce/recipes-xfce/exo/exo_0.6.2.bb

@@ -4,9 +4,9 @@ LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://COPYING;md5=94d55d512a9ba36caa9b7df079bae19f"
 DEPENDS = "gtk+ libxfce4util virtual/libx11 perl-native cairo"
 
-PR = "r0"
+PR = "r1"
 
-inherit xfce
+inherit xfce pythonnative
 
 # SRC_URI must follow inherited one
 SRC_URI += " \
@@ -16,7 +16,6 @@ SRC_URI += " \
     file://fix-qa-desktop-type-error.patch \
 "
 
-
 # see http://wiki.xfce.org/gnomemount-replacement
 do_install_append () {
 	install -m 755 -d ${D}${bindir}/exo-mount-wrapper