package/libuio: add missing dependency on host-pkgconf

configure fails if the pkgconfig.m4 macros are not available during
this package autoreconf:

./configure: line 12003: syntax error near unexpected token `PKGCONF,'
./configure: line 12003: `   PKG_CHECK_MODULES(PKGCONF, glib-2.0)

Fixes:

  http://autobuild.buildroot.net/results/9be944e35090bf270fbc9572423466be9af7b1f2/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libuio/libuio.mk

@@ -10,7 +10,7 @@ LIBUIO_SITE = $(call github,Linutronix,libuio,$(LIBUIO_VERSION))
 LIBUIO_LICENSE = LGPL-2.1 (library), GPL-2.0 (programs)
 LIBUIO_LICENSE_FILES = COPYING
 LIBUIO_CONF_OPTS = --with-glib=no --without-werror
-LIBUIO_DEPENDENCIES = $(TARGET_NLS_DEPENDENCIES)
+LIBUIO_DEPENDENCIES = $(TARGET_NLS_DEPENDENCIES) host-pkgconf
 LIBUIO_LIBS = $(TARGET_NLS_LIBS)
 LIBUIO_INSTALL_STAGING = YES