autoconf: add AUTOHEADER variable

autoheader is used by autoreconf, therefor we need to give the right
path to this tools for host/target autoreconfiguration.

Signed-off-by: Lionel Landwerlin <llandwerlin@gmail.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/autoconf/autoconf.mk

@@ -17,7 +17,7 @@ AUTOCONF_CONF_ENV = EMACS="no" ac_cv_path_M4=$(HOST_DIR)/usr/bin/m4 \
 AUTOCONF_DEPENDENCIES = microperl host-m4
 
 HOST_AUTOCONF_CONF_ENV = ac_cv_path_M4=$(HOST_DIR)/usr/bin/m4 \
-                    	 ac_cv_prog_gnu_m4_gnu=no
+			ac_cv_prog_gnu_m4_gnu=no
 
 HOST_AUTOCONF_DEPENDENCIES = host-m4 host-libtool
 
@@ -26,4 +26,5 @@ $(eval $(call AUTOTARGETS,package,autoconf,host))
 
 # variables used by other packages
 AUTOCONF:=$(HOST_DIR)/usr/bin/autoconf
-AUTORECONF=$(HOST_CONFIGURE_OPTS) ACLOCAL="$(ACLOCAL)" $(HOST_DIR)/usr/bin/autoreconf -v -f -i -I "$(ACLOCAL_DIR)"
+AUTOHEADER:=$(HOST_DIR)/usr/bin/autoheader
+AUTORECONF=$(HOST_CONFIGURE_OPTS) ACLOCAL="$(ACLOCAL)" AUTOHEADER="$(AUTOHEADER)" $(HOST_DIR)/usr/bin/autoreconf -v -f -i -I "$(ACLOCAL_DIR)"