libdrm: configure needs pkg-config

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libdrm/libdrm.mk

@@ -8,7 +8,14 @@ LIBDRM_SOURCE = libdrm-$(LIBDRM_VERSION).tar.bz2
 LIBDRM_SITE = http://dri.freedesktop.org/libdrm/
 LIBDRM_INSTALL_STAGING = YES
 
-LIBDRM_DEPENDENCIES = xproto_glproto xproto_xf86vidmodeproto xlib_libXxf86vm xlib_libXmu xproto_dri2proto pthread-stubs
+LIBDRM_DEPENDENCIES = \
+	xproto_glproto \
+	xproto_xf86vidmodeproto \
+	xlib_libXxf86vm \
+	xlib_libXmu \
+	xproto_dri2proto \
+	pthread-stubs \
+	host-pkg-config
 
 ifeq ($(BR2_PACKAGE_XDRIVER_XF86_VIDEO_INTEL),y)
 LIBDRM_CONF_OPT += --enable-intel