package/xenomai: add host-pkgconf dependency

Without pkg-config PKG_CHECK_MODULES won't be expanded
and ./configure script produces following error message:

./configure: line 13810: syntax error near unexpected token `FUSE,'
./configure: line 13810: `	PKG_CHECK_MODULES(FUSE, fuse)'

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/xenomai/xenomai.mk

@@ -17,6 +17,8 @@ XENOMAI_LICENSE = GPL-2.0+ with exception (headers), LGPL-2.1+ (libraries), GPL-
 # GFDL is not included but refers to gnu.org
 XENOMAI_LICENSE_FILES = debian/copyright include/COPYING lib/trank/COPYING kernel/cobalt/COPYING
 
+XENOMAI_DEPENDENCIES = host-pkgconf
+
 # 0002-boilerplate-build-obstack-support-conditionally.patch
 XENOMAI_AUTORECONF = YES